Heralded as the world's first theater, these ruins are often overlooked as they reside in the shadows of the Acropolis.

These floating gardens show what Mexico City used to look during the Aztec Empire.

The enigmatic skull gazes out over the ruins of a once-great Mayan city.

Three small rooms in the jungle house the most elaborate and intact murals of the Mayan world.

Legend says if you stick your thumb in the hole and it gets wet, your wish will be granted.

Let Ouray’s tallest waterfall sweep your breath away on a dealer’s choice of scenic hikes.

A dangerous narrow-gauge railroad once traced a route through this striking canyon.

Decades of pinball and arcade classics line this South Florida outpost of a popular Northeast arcade.

A sculpture of the famous photograph stands on San Diego's "Greatest Generation Walk."

One of the largest trees of its kind in California.

Built for an exposition in 1915, these horticultural displays have stood the test of time.

An extraordinarily ornate museum in San Diego holds wondrous anthropological treasures.

A blast from the past in central San Diego.

A hidden courtyard houses early 20th-century plaster masterpieces.

The world's largest outdoor organ is played weekly by one of just two civic organists in the U.S.

The New York hotel where tragic visionary Nikola Tesla spent his final hours, destitute and alone but for the pigeons.

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

Where the legendary Orson Welles got his theatrical start before "Citizen Kane."

This unmarked and unloved Manhattan subway grate created one of the most iconic images in American cinema.

A very classy 1920s-era bar right in Grand Central Station.

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

This beloved roadside attraction welcomes visitors with his signature neon smile.

This incredible collection of vintage pinball machines can be played at 25 cents a pop.

These markers are used to determine the ground stability of the Strip.