Lavish royal estate punctuated with heated greenhouses.

Museum in a swimming pool where the water still flows.

Petting this mysterious iron monkey supposedly brings good luck.

A little sculpture with a large wardrobe.

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

Most prolific publishing house in the 1600s open to the public.

Giant marble phalluses on the sacred island of antiquity.

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

Roman ruins top white travertine terraces formed by ancient hot springs.

A mysterious ancient cemetery with Roman sarcophagi and Lycian inscriptions.

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

A Turkish monastery tucked into a cliff wall.

In this historic region, homes and churches are carved into ancient volcanic rock formations.

Mediterranean castle on a tiny Turkish island.

An arresting arch punched straight through a mountain provides one of the most scenic spots, and challenging climbs, on the planet.

This futuristic observatory at the top of the Pyrénées offers unrivaled views.

Abandoned Nazi train station turned underground astroparticle laboratory.

The former home of a trailblazing surrealist is still filled with haunting dolls and grim paintings.