Here, at the "world's longest art gallery," you'll find forty miles of ancient petroglyphs and pictographs.

The fifth-longest natural arch in the world, and the longest outside China.

The only road through the heart of Glacier National Park.

This angular Dwarven tunnel cuts through a mountainside in Glacier National Park.

A beautiful geyser under environmental threat.

An architect's childhood fantasy treehouse made real.

A whimsical, but often overlooked clock in Park Avenue.

Avoid gangster interaction while window-shopping.

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

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

A three-story copper skybridge connects two Manhattan buildings with Art Deco luxury.

A pedestrian island in the middle of world-famous Times Square emits a strange (and purposeful) humming noise.

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

A semi-scholarly approach to sex.

A gigantic 10-foot tall stone man.

The only surviving choragic monument is a trophy awarded in 334 BC for the winning dramatic chorus.

This ancient Greek place of assembly and marketplace is being revealed layer by layer below the modern Athens cityscape.

150 or so scrounged-up lamps, chandeliers, and lanterns light up this alley in central Athens.

The oldest cemetery of modern-day Athens blends the modern and ancient worlds.

The former home of queer novelist Yoshiya Nobuko memorializes her contributions to modern-day manga.

The hometown of a beloved manga artist created a treasure hunt for his popular ghostly characters.

What's believed to be the country's first shrine is, in Shintō mythology, the annual meeting place of the gods.

One of the world's largest tanks mimics the experience of watching rare whale sharks, giant rays, and deep sea creatures from the ocean floor.

A King Kong-like gorilla hangs from the top of this commercial building in Tokyo.