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The tallest building in Fort Collins when it opened in 1923, the Armstrong Hotel contained 41 rooms and two dining halls. After falling into decline since the 1970s, it closed in 2000, but reopened in 2004 after extensive renovations.

Originally built in the 5th century over a Temple of Isis, this octagonal brick structure was patterned after the Church of the Holy Sepulchre in Jerusalem. It was modified in the 11th century.

Begun by Cardinal Wolsey in 1514, Hampton Court Palace became the favored residence of King Henry VIII after 1529 and was expanded by Sir Christopher Wren for William III after 1689. It is now a museum owned by Historic Royal Palaces.

St. Peter's Basilica in Vatican City is the world headquarters of Roman Catholicism and one of the largest churches in the world. Founded by Constantine the Great in 324, it stands over the tomb of Saint Peter the Apostle.

This magnificent ancient temple was built by Emperor Hadrian in 125 and converted into a church in 609. It is the oldest intact ancient building in Rome.

Formerly known as the Portland Public Theater and Paramount Theater, the Arlene Schnitzer Concert Hall was built in 1927.

Now known as McMenamins Chapel Pub, this Italian-inspired building in North Portland was built in 1932 as an architecturally impressive funeral home.

The lovely Italianate-style Spotswood House was built in 1887, remodeled in the 1930s, and thoroughly restored beginning in 2002.

Founded in 639 and rebuilt in 1008, Torcello Cathedral is the oldest church in the Venetian lagoon and the main reason for a visit to Torcello Island. Inside is an important collection of Byzantine mosaics.

Originally built by Emperor Constantine in 326, Trier Cathedral is the oldest church in Germany.

One of the oldest Moorish monuments in Spain, this tiny 10th-century mosque was built over a Visigothic chapel then converted into a church by King Alfonso.