Architecture

This nine-story building is the oldest standing skyscraper in D.C.

A cavernous three-story, 43,800-square-foot basement that was forgotten about for 60 years.

A neo-Gothic temple in central Mexico featuring a labyrinthine network of crypts.

This tiny, hurricane-resistant house in Galveston is one of the city's most notable architectural oddities.

Maryland's first (and last standing) toll house on America's first federal road established the state as the "Gateway to the West."

The Slovenian architect designed many landmarks in the capital city, including his own dream house.

An eight-sided home built during a brief octagon craze in the 1850s.

A long-vacant Scottish Rite temple in Hollywood has been converted into an art museum filled with Masonic relics.

Centuries before the modern seismograph, Armenian monks measured quakes with this tilting pillar.

This supermarket is suspended 25 feet above an interstate highway.

Sections of the iconic limestone columns have been left uncleaned as a reminder of the city's polluted past.

The home of the first American-born saint is one of the only curved buildings in New York.

Two distinctive homes on a New England village green look like a couple of frosted wedding cakes.

This former abandoned hospital, a complex of stunning 19th century buildings, once housed 2,000 psychiatric patients.

Under a glass sidewalk lie the remains of some of Manhattan's oldest buildings.

A public display of random paleontology.

A luxury hotel housed in a former 15th century Gothic church.