A Turkish monastery tucked into a cliff wall.

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

Roman ruins, natural methane fires and a lovely beach.

Large miniature theme park with 100-plus models.

Standing proud atop a Turkish bluff, this Ottoman palace has retained its grandeur despite being abandoned for centuries.

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

While not Turkey's deepest underground city, this subterranean redoubt is the largest.

The best-preserved ancient theater in the world.

Ottoman-era houses lovingly preserved.

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

Live a night as a Byzantine King, with a minibar and private jacuzzi.

A gorgeous, Gaudí-esque stairway constructed in the city of Istanbul by a prominent Jewish family.

Naturally protected city carved from a rock face.

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

These tombs were built into the side of a mountain so that ancient angels could reach the dead.

A Lycian city of the dead carved into the hillside of Southern Turkey, complete with startlingly human touches.

The world's largest wooden structure.

Hidden behind a wall, Spanish nuns distribute their signature sweets on a revolving tray.

Spain's largest bullring offers a unique glimpse at architecture and history.

Drink the 'Blood of Christ' in this Roman Catholic fever dream.

A historic landmark and museum filled with curious objects representing the history of Key West.

Near the ruins of a Civil War coastal fortress lies the only known African refugee cemetery in the United States.

The museum chronicling a treasure hunter's dream, fulfilled.

Leave it to Key West to drop a real-live drag queen instead of a ball to mark the arrival of the New Year.