Hundreds of hidden passageways weave through the old quarters of Lyon.

An airy Art Deco space devoted to the weird and wonderful folk art traditions of Mexico.

The only castle in North America to ever house European sovereigns.

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

This stunning iron gate designed by Modernist architect Antoni Gaudí is filled with mythic symbolism.

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

This ritzy Italian market is built around a statue of an unforgiven heretic who was burned for his belief in an endless universe.

Go inside to really appreciate this 500-year-old technological masterpiece.

The last moments of the ill-fated Pompeiians, frozen forever in plaster.

Thousands of well-dressed mummies below a monastery.

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

The most iconic structure in Scotland has been home to bishops, colonels, and Sean Connery characters.

"Girl in a Wetsuit" is what happens when a sculptor has to find a way around a 100 year old copyright.

Deep in the Guatemalan jungle stands an ancient pyramid that once marked the reign of a king.

A cluttered and astounding collection of antiquities and curiosities.

At 929 pounds and 26 feet tall, this stainless steel fork can only be used by the likes of King Kong.

At night, bats patrol this magnificent 18th-century space in search of book-eating pests.

The oldest Roman lighthouse still in use.

These remote Florida islands have a history of sea turtles and sunken treasures, and one of the world's largest coastal brick fortresses.

An Art Nouveau gem hides beneath the layers of city grime obscuring this once-magnificent building.

Neal Cassady may still have an open tab at one of Denver's oldest watering holes.

This hilltop park offers magnificent views and a Frank Lloyd Wright masterpiece.

The vibrant buildings in the “capital of the comic strip” celebrate the art form that made it famous.

On this romantic tidal island reachable only at low tide the tomb of a famous French writer overlooks the sea.