The only castle in North America to ever house European sovereigns.

These millennia-old murals once covered the walls of residential complexes across the ancient city.

Dating back to the second century, vestiges of prehispanic mural paintings are found in this underground palace.

Cool down and fill up after visiting Teotihuacán at this bar and restaurant in a deep, underground cave.

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

A dark patch of the ceiling at Grand Central Terminal which was not restored is still stained brown by tobacco.

A Route 66 filling station that was designed to resemble the Hagia Sophia, and is now the symbol of an arts district.

A dedication plaque on this Boston tunnel is a microcosm of a massive, controversy-laden construction project.

A museum dedicated to the history and exploration of both popular music and science fiction.

Row, row, row your pumpkin quickly down the stream.

An artifact taken from one of America's shortest wars.

Supposed Massachusetts Grave of a pre-Columbus Knight Templar.

The only fully-realized skyscraper built by the famed American architect, Frank Lloyd Wright.

Time travel with sweets across history at this research-based candy store.

The last holdout of a pre-Civil War rebel who took the matter of slavery into his own hands.

This advertisement for talcum powder was painted on the rock face and has since defied removal.

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

A museum cafe showcases Native American dishes and indigenous ingredients from across the Western Hemisphere.

The oldest continuously operating fish market in the United States.

The oldest living cultivated fruit tree in North America.

Books you don’t need in a place you can’t find.

In Gloucester, Massachussets, fishermen celebrate a successful year at sea by charging a lubed pole to capture an Italian flag.

Explore the dark underground corridors of this graffiti-covered former military fortification.

This giant iron playfully pays tribute to an early 20th-century architectural trend.