These steeply terraced ruins are a stop along the Inca Trail to Machu Picchu.

Preserved Inca city and site of the last Inca stronghold against the Spanish conquistadors.

The intricate stonework of Machu Picchu serves as a testament to Incan engineers.

Protecting the dead from opportunistic body snatchers.

17th century streets hidden under Edinburgh were once a breeding ground for the black death.

The final resting place of soldiers' loyal canine companions.

A church that bred legends, and served as an inspiration for the Da Vinci Code.

This singular Irish dolmen is more Frank Lloyd Wright than upright stonehenge.

A hugely vast Irish landscape of barren rock that stretches for miles.

The largest Neolithic ruins in the world hide a notably clean prehistoric metropolis.

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

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

An 18th century wonder of the world, lost in WWII, re-created at the Catherine Palace.

It houses the remains of a 17th-century version of the Titanic.

The small town of Poulsbo in Washington state is the next best thing to the Kingdom of Norway.

A walk through the historic city center, under the streets of Seattle.

Furniture tries to escape an abandoned building in San Francisco.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

The oldest cemetery in New Orleans, resting peacefully for over 200 years now.

Frida Kahlo's childhood home, now a museum of her life and works.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

A peculiar mansion built by the troubled heir to the Winchester Rifle Company fortune.

The unbelievably opulent home built for an infamous newspaperman.