A former waterfront market is now in the center of town due to some interesting Boston engineering.

See the sky in a new way through this art installation.

An annual extravaganza of Broadway theater memorabilia.

A museum collection honoring the long history of the FDNY is held in a disused Manhattan fire house.

There must be a pun in this haystack somewhere...

The most confusing clock in New York.

The "Seinfeld" diner.

A bit of retro transportation flair preserved in the world's largest department store.

This historic address is home to the beloved ball and is an almost totally empty building among the most expensive real estate in the world.

An artist's cute bronze subway sculptures belie his violent artistic past.

Visit the monolithic tomb of America's most famous general.

This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.

The name of this famed hospital was once a byword for the horrors of medical and psychiatric care.

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

This cemetery has graves dating back to the 17th century, including the city's oldest carved tombstone and an ominous cryptogram.

A semi-scholarly approach to sex.

London's last remaining public soapbox site has seen speeches from Karl Marx, Vladmir Lenin, and George Orwell.

A 300-year-old tea shop that brought tea to the English people, not to mention the Queen herself.

An alleyway plaque is all that remains of the independent Texas' envoy that forgot to pay their rent for over a century.

A statue in Budapest's Liberty Square honors the former U.S. president's efforts to end the Cold War.

A random tree outside a Budapest hotel has become a DIY shrine to the late singer.

From Austrians to Nazis to Soviets, this historic Budapest fortress has a history as complex as the city itself.

A series of caves under Castle Hill that once held the prisoner Vlad Tepes, better known as Count Dracula.

Budapest's Communist-era statues, banished to the suburbs.