Curious onlookers have suspected this strange structure is a secret government base.

This enormous monument is one of the most iconic structures in Tokyo, rudely nicknamed "The Golden Turd."

An enormous pair of straw sandals woven in the traditional way—to keep demons at bay.

Once a black market electronics marketplace, now an otaku shopper's paradise.

The legendary birthplace of the Japanese maneki-neko is dotted with hundreds of lucky beckoning cats.

Swarms of dainty flying insects swarm into the Petaloudes Valley to get busy.

Natural cathedral designed by Italian artist Giuliano Mauri.

The bridge is a secret gallery of discarded gum that has been transformed into miniature masterpieces.

An architectural oddity hides in plain sight on this iconic London bridge.

This one has sailed five times as far as Sir Francis Drake's famous ship.

Ship-sized kinetic sculptural fantasy.

Six ravens are kept captive (but well-fed) at the Tower of London to prevent the fall of the Crown.

Thanks to modern navigational tools we now know that the true prime meridian runs through a park next door.

London's smallest police station is barely the size of a phone booth.

Catacombs turned marketplace.

A 1,215-foot tunnel transports pedestrians beneath the River Thames.

A student driver's nightmare.

Eighty million natural history specimens call this gargantuan museum home.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

Two geological phenomena in one precarious locale: a towering stone window, and a deep blue void.

This spectacular dome managed to survive after being bombed in World War II, in an event known as the "Miracle of Mosta."

Stone Age solar temple is aligned with the sun on each equinox and solstice.

The enigmatic sculpture hides above an escalator in a Milan metro station.

Milan's duomo is covered in beautiful carving including a curious "dinosaur-like" beast.