This London plaque marks the spot where David Bowie's famous alien made his debut.

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

Hear the quietest sound from across the dome.

Eighty million natural history specimens call this gargantuan museum home.

The popularity of Sherlock Holmes led to the creation of his fictional address, turning the orderly London street numbers askew.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the first ‘Harry Potter’ film.

One part local history, 99 parts gruesome haunted house.

A charming 17th-century alley is lined with secondhand bookstores and antiquarian shops.

This little Greek plateau is home to thousands of rustic, white-sailed windmills.

The ancient latrines of the Greeks, in all their public glory.

This historic hotel preserves many treasures from its heyday hosting passengers on the Orient Express.

This crumbling medieval basilica once attracted pilgrims by the thousands to collect a miraculous dust that formed above the saint's tomb.

This half-forgotten fortress was constructed by the Ottoman conqueror of Constantinople.

This ancient subterranean megalopolis is known for the hot oil traps that were installed above each of its entrances.

Carvings in Turkey's Marble Road may have directed ancient Romans to a hidden brothel.

Seven early Christians were sealed into a cave where legend has it they slept unharmed for centuries.

This Turkish cave boasts some rather bizarre associations with the King of Mount Olympus.

A charming beach town in Turkey captures all the colors of the rainbow.

The alleged house of the Virgin Mary is tucked away in a park and nature preserve on Mt. Koressos in Turkey and is holy to both Catholics and Muslims alike.

The best-preserved ancient theater in the world.

A small etching on the white marble parapet was written in runic script by a Viking mercenary.

Flames have been burning within this mountain for more than 2,500 years.

1513 Turkish world map, full of European state secrets and snarky commentary.

Roman ruins, natural methane fires and a lovely beach.