This unusual lava tube spouts seawater during high surf.

Take shelter from Hawai'i's tropical heat under the massive canopy of largest Banyan tree on the island.

This blowhole is supposedly caused by a trapped monster.

These ancient sacred grounds granted amnesty to those who managed to reach them.

Perched on a spindly rock spire in a Greek archipelago, this lighthouse would make a perfect wizard's tower.

This unique rock formation is quite the local celebrity, although one day it may come crashing down.

According to the Guanches, the aboriginal people of the Canary Islands, the king of evil lives inside this volcano.

Behind this pair of dragon trees, there is a tragic story of lost love.

Spanish architects used seized Muslim gravestones to rebuild parts of the fortress.

A stonemason's hilarious revenge came in the form of this peculiarly positioned gargoyle.

It's good luck to be mocked by this monkey.

This ancient Egyptian obelisk still bears the wounds of World War I.

England's most famous front door has an accidental doppelganger.

These ornate arches show how the course of the River Thames has changed.

A series of carved figures that scandalized British society.

Formerly known as Saville Theatre, this mid-20th-century entertainment hub includes an ornate frieze.

The medieval woodcut-style artwork chronicles life in medieval London.

The Tudor-style cottage in the middle of the square is not quite what it seems.

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

These official units of measurement—including chains and perches—lie hidden beneath tourists' feet in a popular London hub.

A mysterious shape catches the eye in this 16th-century painting.

A statue of the legendary Celtic warrior queen who fought the Roman invaders stands in one of the cities she once destroyed.

The sumptuous ceiling was one of the last things Charles I saw before his execution.

Originally meant to hold a statue of King William IV, this support sat empty for years. Today, it hosts a rotating cast of public artwork.