A tree-like building perches on its trunk in the Steglitz neighborhood of Berlin.

The fairy tale castle of the "fairy-tale king."

A museum and shop on Bourbon Street located in the former home of the second Voodoo Queen of New Orleans.

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

The final resting place of New Orleans' most famous voodoo priestess.

A 200-year-old bar in the historic French Quarter refuses to give up its place in history, nor its role in securing ours.

The headquarters of the famous Yale society.

The former home of Samuel Clemens and family remembers the happiest period of the author's life.

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

Staircase winds down the side of Telegraph Hill through gardens, wild parrots flying overhead.

San Francisco's newly reopened hands-on science museum.

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

This 11th century tower is said to be the oldest building in Oxford.

One of Europe's oldest libraries.

The quiet field that inspired one of the most famous songs of all time.

The Liverpool street made famous by the Beatles is real.

This city square is home to Amsterdam's oldest church and a statue honoring Dutch sex workers.

The history and future of cannabis.

The attic of a four-century-old canal house hides a clandestine church.

Museum preserving torture methods from the past.

An existential riddle in the world's largest ancient castle.

A surreal statue honoring Prague's favorite literary son.

Synagogue built from the stones of Solomon's temple contains the golem of Prague.

A mocking tribute to the past and modern leadership of Prague.