This one-time health resort was used by aristocrats around the world.

A preposterously luxurious hotel with gold-plated iPads, Rolls Royce chauffeurs, and a staff that trains by watching "Downton Abbey."

On any given day this sprawling market houses literally tons of government-regulated gold, gems, and precious metals.

A subterranean house of worship carved right out of the bedrock.

An alien church provides much needed silence in the midst of a Finland shopping center.

These historic defenses ensured the city within would survive hundreds of years of occupations, sieges, and invasions.

This abandoned airplane hanger is said to have once been a top secret launch facility.

Bridge that died in war and was resurected.

Oriental bazaar in the heart of Sarajevo.

This piece of Australian modern art is part joke and part history.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

A medieval replica of King Arthur's legendary table, the Round Table hanging in Winchester Castle was decorated by Henry VIII.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

The Isle of Wight’s “Island Line” serviced by former London Underground trains from the 1930s.

This expansive bridge in the Canadian wilderness was originally just built for friends.

Hear the quietest sound from across the dome.

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

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

This subterranean necropolis holds three floors of antler-dug grave caves.

Burial grounds for more than 1,000 bodies deep under the modern town of Rabat.

Where once there was a train station bathroom, there is now this German burger joint.

On the Spree bank, discover one of the last reminders of a symbolic wall that divided, and was torn down by the people.

From Iggy Pop to David Bowie to Nick Cave, this regal music studio has served some of the all time greats.

Cold war icon and onetime "hole" in the iron curtain.