Less a museum than a bizarre fantasy world created by artists and engineers.

The oldest surviving bridge in New York City, which reopened to pedestrians in 2015.

This Irish show cave is said to have been the site of a Viking massacre that claimed 1,000 lives.

This hidden green space is the city's second largest conservatory.

Hear the quietest sound from across the dome.

This former tuberculosis research hospital endeavored to cure the dreaded disease with fresh air and positive attitudes.

A three-story copper skybridge connects two Manhattan buildings with Art Deco luxury.

Mysterious 500-year-old tapestries depict a unicorn hunt.

An ancient passage filled with stalls selling used books, once frequented by Vincent Van Gogh.

One of only two commuter aerial tramways in the United States.

Florida might be at its most surreal in this museum devoted to the famed Spanish artist.

Whisper secrets in a busy station only to be heard on the other side of this acoustic arch.

A much more welcome kind of snowbird vacationer, manatees camp out in these springs every winter.

The Corinthian columns that towered over Abraham Lincoln’s inauguration stand proud.

The site of the climactic scene from the classic horror film is now a historic landmark.

Home to items never before seen by the public.

Hollywood's most famous landmark, the "temporary" sign that has stood for decades longer than intended.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

Home of an evil witch famous within southern folklore.

Hidden in Central Park's Ramble is a troublesome cave buried just beneath the surface.

Continuing the tradition of the dime museum in style.

Winding paths and ramshackle mausoleums in the oldest "park cemetery" in London.

Elevated freight railway turned wildly successful urban park.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.