St. Mary's features one of the most spectacularly decorated cathedral interiors in all of Europe.

Beneath Kraków Old Town's main square lies a hologram-filled medieval market vampire graveyard wonderland.

A monument to the three wars that led to German unification towers within a Berlin traffic circle.

The prototype for all Nazi concentration camps.

What started as a tongue-in-cheek shrine is now a full-blown museum celebrating "The Hoff" and his longtime love affair with Berlin.

The bunker where Hitler took his own life is hidden under this deliberately ordinary parking lot.

This World War II bunker now survives as a documentation of the Nazi regime and war crimes.

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

The most visited, and possibly most controversial, museum in Germany.

Designed as a reminder of one of the darkest moments in Austrian history.

The design of this beautifully crafted building was inspired by Norwegian glaciers.

One of the most breathtaking railways in Europe also takes one of the steepest climbs, from fjord to mountain plateau.

This concrete tangle of square pipes has stood as a proud thorn in the city's side since the '70s.

Gold Rush ship-turned-hotel buried underneath San Francisco's financial district.

Only hotel where you can legally launder money.

The second building of its name to occupy this location might be the finest flatiron building in San Francisco.

A former hardware store near Yerba Buena is the official home of California's history.

A still functioning vaudeville carousel that has operated for over a century boasts a colorful menagerie and past.

Forgotten and then destroyed by fire, this was once one of the largest saltwater swimming pools in the world.

Once the largest windmill outside of Holland, with enormous 114 foot sails.

San Francisco's urban bison herd has persisted in the face of extinction, development, and disease.

The remains of a ruined mansion memorialize the 1906 earthquake.

A garden oasis filled with flowers mentioned in the works of William Shakespeare.

A winding path built in secret on the edge of the continent.