This school was designed to support the rebuilding of African American schools around Delaware.

It may look like no more than a full-scale model, but every part of this full Space Shuttle stack had a working role in aviation history.

The only subway station in the city that still makes use of gap fillers.

A commemorative plaque hides a door that leads down to the New York Public Library's underground book bunker.

An homage to Jackie Gleason's bus-driving character from 'The Honeymooners.'

Public opinion is still divided on this enormous sculpture in front of Baltimore's Penn Station.

Try not to get slimed in Tribeca.

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

An abandoned church gets a second life as a massive beer hall and event space.

An aptly-named street near the birthplace of the modern LGBT rights movement.

Once a favorite playground for the world's most illustrious guests, Hotel Nacional's secret weapons and bunkers reveal a more menacing side to its golden history.

No telescopes, no power, no gift shop: The Observatory of Chichen Itza, one of the world's oldest observatories, takes astronomy back to basics.

Clap your hands at the base of the pyramid, and the song of a sacred Mayan bird will echo through the air.

One of Mexico's youngest major cities still holds on to this structure representing its short modern history.

A small collection of iguana-infested ruins hides amid Cancún's bustling hotel zone.

Compensation for the destruction of a historic shipyard.

Strange red rock formations that have been attributed to a higher power for hundreds of years.

There are eight natural springs around town, each with a slightly different taste.

While most of the games in this arcade take quarters, that would have been a small fortune when they were made.

America's oldest Italian restaurant is a San Francisco institution.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

The longest-covered bridge in the state of Maryland.

The façade of this building looks like a bingo board, but it's really a giant clock by a famed graphic designer.