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

Currently housing a corporate bank branch this building at the southern tip of Manhattan was once the gateway to luxury vacationing.

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

The highest rapid transit station in the world.

This unusual subway stop was originally a real estate office.

A tree that grows parallel to the ground was declared Brooklyn's "crowning curio" by the poet who saved it.

The site of a fallen tree that protected Americans from British forces during the American Revolution.

This whimsical group of statues is a favorite of children who love to climb all over Lewis Carroll's beloved characters.

This charming colonial alleyway is one of the oldest continuously used residential streets in the U.S.

One of the now-less-hidden floral gems of the "Emerald Necklace."

This colonial tavern played host to George Washington, Thomas Jefferson, and other famous early Americans.

The Byzantine, pre-Columbian, and medieval art at this stately mansion are some of the most under-appreciated collections in D.C.

A 1,100-ton train fell through the floor in 1953. Workers got it patched up in just 72 hours.

This kitsch eatery is chock-a-block with bric-a-brac.

The semi-reclaimed ruins of this canal were once part of an ambitious plan to reroute the mighty potomac.

This lovely picnic spot featuring thunderous jet landings is an aircraft spotter’s dream.

This bug-eyed water wheel uses the power of the Sun to clean up Baltimore Harbor.

Once home to seven different roller coasters, Glen Echo has undergone many transformations since its founding in 1891.

New York City's smallest piece of private property.

There’s a hidden military meme engraved on the World War II Memorial.

The romance of early commercial flight still fills this Art Deco destination.

Step inside Lucy, the world's largest "elephant."

Dr Barnes' $25 billion private collection of art and arboretum.

A downtown park built on top of unclaimed graves.