Question: Who designed the hotel that was one of the artificial structure in Bretton Woods, New Hampshire?

Context paragraphs:
Mount Pleasant House (New Hampshire): Mount Pleasant House was a grand hotel in the White Mountains of New Hampshire, in the area of Bretton Woods.  It was built in 1875 and opened in 1876.  Mount Pleasant House was one of three grand hotels in the area at the time during the early stages of an era of epic hotel building and more came soon after.  The other early grand hotels in Bretton Woods were White Mountain House and Fabyan House.

Bretton Woods, New Hampshire: Bretton Woods is an area within the town of Carroll, New Hampshire, United States, whose principal points of interest are three leisure and recreation facilities.  Being virtually surrounded by the White Mountain National Forest, the vista from Bretton Woods toward Mount Washington and the Presidential Range includes no significant artificial structures other than the Mount Washington Cog Railway and the Mount Washington Hotel.

Crawford Depot (Carroll, New Hampshire): Crawford Depot, also known as Maine Central Passenger Railway Station, is a historic passenger railroad station at the top of Crawford Notch in the Bretton Woods area of the town of Carroll, New Hampshire.  Built in 1891, it is a surviving emblem of the importance of the railroad in the area's history as a tourist destination, and is one of the finest examples of Queen Anne railroad architecture in northern New England.  Now home to a visitors center operated by the Appalachian Mountain Club, it was listed on the National Register of Historic Places in 1982.  It is also the northern terminus of most trains on the "Notch Train" service of the Conway Scenic Railroad.

Bretton Woods Conference: The Bretton Woods Conference, formally known as the United Nations Monetary and Financial Conference, was the gathering of 730 delegates from all 44 Allied nations at the Mount Washington Hotel, situated in Bretton Woods, New Hampshire, United States, to regulate the international monetary and financial order after the conclusion of World War II.

Carroll, New Hampshire: Carroll is a town in Coos County, New Hampshire, United States.  The population was 763 at the 2010 census.  The two largest villages are Twin Mountain and Bretton Woods.  Carroll is an important access point for recreational areas in the White Mountains, including many 4,000-footers, the Zealand River area, the Presidential Range, and the Presidential Dry River Wilderness.  The town is crossed by the Appalachian Trail and is home to the Mount Washington Hotel at Bretton Woods.  It is also home to the Highland Center at Crawford Notch, the Appalachian Mountain Club's four-season lodge.

1973 Volvo International: The 1973 Volvo International was a men's tennis tournament played on outdoor clay courts at the Mount Washington Resort in Bretton Woods, New Hampshire in the United States.  The event was part of the 1973 Commercial Union Assurance Grand Prix circuit and classified as C category.  The tournament was held from July 23 through July 29, 1973.  Vijay Amritraj won the singles title.

Mount Rosebrook: Mount Rosebrook is a mountain in New Hampshire's White Mountains.  It is part of the Bretton Woods Ski Resort - the largest in New Hampshire.  Mount Rosebrook is 2,976 feet (907 meters) tall.

International Clearing Union: The International Clearing Union (ICU) was one of the institutions proposed to be set up at the 1944 United Nations Monetary and Financial Conference at Bretton Woods, New Hampshire, in the United States, by British economist John Maynard Keynes.  Its aim was to have been regulation of currency exchange, a role eventually taken by the International Monetary Fund (IMF).

Bretton Woods Mountain Resort: Bretton Woods Mountain Resort is a ski area located in Bretton Woods, New Hampshire, across from the Mount Washington Hotel.

Mount Washington Hotel: The Mount Washington Hotel is a hotel in Bretton Woods, New Hampshire, near Mount Washington.  It was designed by Charles Alling Gifford.

Supporting paragraphs: Bretton Woods, New Hampshire Mount Washington Hotel
Answer: Charles Alling Gifford