These unusual rooms on wheels are holdovers from the 1960s.

The headquarters of one of the world’s longest-running humor magazines bears a noticeable resemblance to a head wearing a Prussian helmet.

This historic World War II ship is one of only 4 Fletcher-class destroyers remaining worldwide.

An alley way dedicated to graffiti and street art is a constantly changing street gallery.

Tucked away amidst some of the most famous addresses in the world is New York’s only fraction of a street.

Spinning silently in the lobby of an Art Deco masterwork is a massive vintage model of the Earth.

Twice a day one of these tragic bronze mariners drowns with the tide to remember all those the sea has taken.

Built hundreds of years ago this downtown iron barrier once protected a much despised king.

A Manhattan tombstone honors a popular 19th-century heroine, now long forgotten.

Lady Liberty's first beacon of enlightenment is now displayed in a museum near the statue.

Fake subway tiles were installed to cover a design that resembled the Confederate flag—it's unclear if the resemblance was intentional.

The 28-foot granite map plots the locations of 40 theaters in New York City.

The mummified relics of an American missionary.

This Manhattan museum houses one of the largest collections of Spanish art and manuscripts outside of Spain.

This hidden oasis features a stunning view of the Hudson River and the Palisades from a castle-like museum.

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

This monument is dedicated to Balto, the heroic Alaskan sled dog.

This memorial honors thousands of enslaved Africans and their descendants who died in colonial New York.

This Asian-inspired tower in a lush urban park provides spectacular panoramic views of Baltimore.

Baltimore's classic clock tower was once topped by a rotating, 20-ton medicine bottle.

It’s not hard to see why the historic Peabody Conservatory of Music’s library has been described as a “cathedral of books.”

The ruins of one of the first railroads in the U.S. lie hidden within a neighborhood cul-de-sac.

The Cape Cod house that whaling built.

The first transatlantic wireless communication between the U.S. and Europe took place here in 1903.