Question: Berkhamsted railway station is near what building constructed by Robert of Mortain?
Context: Delhi Junction, also known as Old Delhi Railway Station (station code DLI), is the oldest railway station of Delhi city and a Junction station.  It is third busiest railway station in India in terms of frequency of trains after Kanpur Central and Vijayawada Junction.  Around 190 trains starts, ends, or passes through the station daily.  It was established near Chandni Chowk in 1864 when trains from Howrah, Calcutta started operating up to Delhi.  Its present building was constructed by the British Indian government in the style of nearby red-coloured fort and opened in 1903.  It has been an important railway station of the country, and preceded the New Delhi Railway Station by about 60 years.  Chandni Chowk underground station of the Delhi Metro is near it. Matale Railway Station is the terminus railway station on the Matale railway line of Sri Lanka.  It is the 65th railway station on the line from Colombo Fort railway station and is located in the Matale District in the Central Province.  It is 148.6 km from the Colombo Fort Railway Station and 27.64 km from the Kandy Railway Station. it's the end of railway line, because of water flowing beneath the ground, railway lines cannot be constructed beyond matale. Berkhamsted railway station is in the town of Berkhamsted, Hertfordshire, England.  It is located just beside Berkhamsted Castle, overlooking the Grand Junction Canal.  The station is 28 mi north west of London Euston on the West Coast Main Line.  London Midland operates services to London, Northampton and many other destinations. Lamphun Railway Station is a railway station located in Lamphun, Thailand.  It is the main railway station of the province and is owned by the State Railway of Thailand.  Lamphun Railway Station is 729.213 m from Bangkok Railway Station.  The station building is a wood structure and a small dirt road leads up to the railway station.  To the south of the railway station is a metal railway bridge crossing the River Kuang. The Nanjing South Railway Station () (IATA: NKJ) is a high-speed railway station in Nanjing, Jiangsu, People's Republic of China, serving the Jinghu High-Speed Railway, Huning Intercity Rail, Ninghang Passenger Railway and the Huhanrong (Shanghai–Wuhan–Chengdu) Railways.  The New Nanjing South Railway Station station is located a few kilometres south of downtown Nanjing.  The station's construction site is already connected with central Nanjing by Line 1, Line 3 and Line S1 of Nanjing Metro.  On September 30, 2016 the metro station served a peak volume of 102,300 passengers.  According to CCTV, it is the world's second largest railway station in terms of GFA (Gross Floor Area) at 458,000 square metre (4,929,871 square ft).  The dimension of the main roof is 456m x 216m (excluding smaller roof on both sides of the main roof), the main roof is constructed with steel weighing more than 8000 tons.  The roof on top of the waiting hall area (part of the main roof) is 72,000 square meter (775,001 square ft).  The entire railway station has 128 escalators, and 28 platforms (a combination of island-platforms and side-platforms).  At the peak of the construction phase, there were more than 20,000 construction workers and engineers at work.  Solar panels cover the majority of the railway station roof and are capable of providing 7.17 MW (megawatt) of electricity. Rugby railway station serves the town of Rugby in Warwickshire, England.  It opened during the Victorian era, in 1885, replacing earlier stations situated a little further west.  Since the closure of the former Rugby Central station on the now-abandoned Great Central Railway route through the town, it is Rugby's only station.  Between 1950 and 1970 the station was known as Rugby Midland before reverting to its original title.  The station underwent an extensive upgrade during 2006-2008, with extra platforms added, and a new ticket office and entrance building constructed, however the original Victorian part of the station was retained in the upgrade. Bekal Fort Railway Station is one of the important railway station in Kasaragod district which serves thousands of people per day.  It comes under the Southern Railway Zone of Indian Railways.  Bekal Fort Railway Station handles over 10 trains and serves about 5000 of people per day.  It is situated next to the Bekal Fort Beach and near to the Bekal Fort.  The older name of this railway station was Pallikkere Railway Station.  But later, it was named after the Bekal Fort as 'Bekal Fort Railway Station'.  The Indian Railway has about 13 acres of land in the surrounding of the Bekal Fort Railway Station. Ochira railway station (Code:OCR) is an 'E-Class' railway station, situated near the city of Kollam in Kollam district of Kerala.  Ochira railway station is situated at the borders of Kollam district.  It falls under the Thiruvananthapuram railway division of the Southern Railway Zone, Indian Railways.  The railway station is situated between Karunagappalli and Kayamkulam.  The nearest important major rail head is Kollam Junction railway station.  The other major railway stations near oachira are Kayamkulam Junction railway station and Karunagappalli railway station. Liverpool Lime Street is a terminus railway station, and the main station serving the city centre of Liverpool.  Opened in August 1836, it is the oldest grand terminus mainline station still in use in the world.  A large building constructed in the Renaissance Revival style fronts the station.  A branch of the West Coast Main Line from London Euston terminates at the station, as well as TransPennine Express trains and other train services.  The underground Lime Street Wirral Line station on the Merseyrail network is accessed via the main terminus.  Lime Street is the largest and oldest railway station in Liverpool, and is one of 18 stations managed by Network Rail. Berkhamsted Castle is a Norman motte-and-bailey castle in Berkhamsted, Hertfordshire.  The castle was built to obtain control of a key route between London and the Midlands during the Norman conquest of England in the 11th century.  Robert of Mortain, William the Conqueror's half brother, was probably responsible for managing its construction, after which he became the castle's owner.  The castle was surrounded by protective earthworks and a deer park for hunting.  The castle became a new administrative centre of the former Anglo-Saxon settlement of Berkhamsted.  Subsequent kings granted the castle to their chancellors.  The castle was substantially expanded in the mid-12th century, probably by Thomas Becket.
Answer: Berkhamsted Castle