Tomar attracts many tourists because of its varied monuments. These include:

Castle and Convent of the Order of Christ – Unesco World Heritage Site: An ensemble of 12th to 16th century architecture and art, it is the main monument of the city and one of the most important in Portugal.
Aqueduct of Pegões – Built between 1503 and 1614 to bring water to the convent of Christ in Tomar under command of king Philip I, the aqueduct is 6 kilometers long and in places reaches a height of 30 meters. It is the biggest and most important construction of Philip I in Portugal.
Church of Santa Maria do Olival: This 13th century Gothic church was built as a burial ground for the Knights Templar and their treasure.
Synagogue of Tomar: the best preserved mediaeval synagogue of Portugal (and one of two pre-expulsion Synagogues in the country), built in the mid-15th century the Jewish community of Tomar. Since 1939 it houses the Jewish Museum Abraão Zacuto, with pieces related to Jewish history in Portugal.
Church of Saint John the Baptist (São João Baptista): The main church of Tomar is located in the main square of the town, in front of the Municipality (17th century) and a modern statue of Gualdim Pais. The church was built between the 15th and 16th centuries. In addition to its architectural interest it is noted for several panels painted in the 1530s by one of Portugal's most renowned Renaissance artists, Gregório Lopes.
Chapel of Our Lady of the Conception (Nossa Senhora da Conceição): Chapel built between 1532 and 1540 in pure Renaissance style, begun by João de Castilho and finished by Diogo de Torralva. It was intended to be the burial chapel of King John III.
Church and Convent of Saint Iria: An early 16th century building located near the Nabão river.
Museu dos Fosforos (Matchbox Museum) – The biggest private matchbox collection in Europe.
Museu de Arte Moderna – Colecção José Augusto França (art gallery)
Casa Museu Fernando Lopes Graça
Casa dos Cubos (art gallery)
The streets and squares of the picturesque centre of Tomar are organised following a chessboard pattern, a rare feature for a mediaeval city, instituted by Prince Henry the Navigator, which later inspired the pattern used for the rebuilding of Lisbon after the earthquake in 1755. Scattered throughout the town there are many interesting houses with Renaissance, Baroque and Romantic façades. By the river Nabão, near the bridge, there is a park and garden that offer views of the city and surroundings.
Give me a comma separated list of the main attractions in Tomar.
Castle and Convent of the Order of Christ, Aqueduct of Pegões, Church of Santa Maria do Olival, Synagogue of Tomar, Church of Saint John the Baptist, Chapel of Our Lady of the Conception, Church and Convent of Saint Iria, Museu dos Fosforos (Matchbox Museum), Museu de Arte Moderna, Casa Museu Fernando Lopes Graça, Casa dos Cubos (art gallery)