The vast, legendary catacombs hold secrets much stranger than stacked bones.

While most bridges allow roads to pass over water, this one allows water to pass over a road.

This Tudor-era castle was once part of King Henry VIII's plan to protect England from invasion.

The tallest mountain in mainland Netherlands isn't actually very tall.

Climb a steep hill in 90 seconds on the second-oldest urban subway in the world.

Drink among marionettes at this pub inside a historic puppet theater.

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

The legendary giant's severed hand sits on Antwerp's popular shopping street.

The ornate miniature mansions were built for Istanbul's feathered residents.

This road earned its macabre nickname after hundreds of Iraqi troops died along it in 1991.

Kuwait City's uniquely designed water towers look straight out of a retro sci-fi cityscape.

Rusting ships sit in a desert where a sea used to be.

The oldest Buddhist monastery in Mongolia has survived centuries of invasions, political shifts, and religious purges.

Light still pours into the ruins of this ancient Islamic observatory.

A cemetery with goat-horn bedecked gravestones.

The world's tallest boat lift stands as a massive piece of industrial tourism.

Climb inside an iron crystal magnified 165 billion times its normal size.

Old ships and machinery fill a historic harbor in the city that's home to Europe's largest port.

A giant floating rubber duck-bunny painted with a different design every year.

The Rozenberg wind wall in South Holland makes for smooth sailing through the Calandbrug canal.

Marked by the hand of the explorer Henry Morton Stanley.

Named after a legendary garden called Eram in southern Arabia, built by order of Shaddad, an Arab king who wanted to compete with Paradise.

Putrefaction plateaus in Iran, where the dead were sent for decontamination before going to their final resting place.

Long before air conditioning, Persian architects found an ingenious way to cool off.