Many people don't realize there’s a lot going on in—and below—the world’s tallest triumphal arch.

A barbarous band of serpents guard the bases of these Aztec temples.

A Lovecraftian altar of nightmarish bronze chairs sits ominously on a boardwalk in Puerto Vallarta.

A graceful natural rock formation stands astride the point where the Gulf of California meets the Pacific Ocean.

Mexico's astounding mummy museum with "the world's smallest mummy."

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

This demon atop the Notre-Dame de Paris looks utterly bored.

This influential Renaissance-era library was once the haunt of kings and monks.

Sitting in the basement of a castle, the largest wine barrel in the world is bigger than most apartments.

This 14th-century temple is also known as the "Temple of the Golden Pavilion" for its gorgeous gilded reliquary hall.

This Buddhist temple is home to the graves of the Japanese national legends, the 47 Ronin.

One of Amsterdam's narrowest houses is located right across the canal from its widest.

This legendary giant, born from vegetables, terrorized townspeople and cheated local children in games.

A man throwing a giant severed hand towers over Antwerp’s main square.

Climb to the top of its spiral spire for spectacular views of Copenhagen.

Pilgrimage site for star-crossed lovers.

This opulent Pueblo Deco movie palace melds Art Deco and Native American motifs.

It's easy to see why this eclectic architectural wonder has been dubbed the "Spaceship House."

If drivers cross the rumble strip on this stretch of Route 66 at just the right speed it plays "America the Beautiful."

The second-largest gold nugget in existence, displayed in a Las Vegas casino conveniently named the Golden Nugget.

This quirky UFO-shaped curiosity is often mistaken for the airport’s control tower.

The fairy tale castle of the "fairy-tale king."

A castle from the Holy Roman Empire that hosts traveling youth... in its stables.

Danish tourist destination well known for open stalls where vendors sell marijuana on the street.