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

An imperial church bombed to ruins during WWII now stands as a jagged memorial.

The "Prussian Versailles" that is as glorious today as when it was built.

Ride in 1960s style on the private luxury train Marshal Josip Tito used to travel around Yugoslavia.

This once-derelict building is now one of the most beautiful bookstores in the world.

Super-heavy Nazi architectural experiment.

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

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

Huge masonic hall in Philadelphia with lavishly themed rooms.

The sounds of the world's largest fully functioning pipe organ dazzle shoppers at a Philadelphia Macy's.

The fastest transatlantic ocean liner sat abandoned in a Philadelphia shipyard for decades.

The last of Philadelphia's wood-paved streets is now a landmark of terrible engineering.

The first American department store, and home to the largest operating musical instrument in the world.

This elaborate towering structure was once famed for its revolutionary height.

The world’s first penitentiary, meant to be humane, drove men insane.

Yo, Adrian!

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

It's rumored this unique Baltic beacon was designed by Gustave Eiffel himself.

What almost started out as a spite house became an eccentric's found object masterpiece.

This ducal residence was once home to a future Russian empress and a French king in exile.

This celebration of Latvia’s freedom and independence avoided demolition over half a century of Soviet occupation.

3,000 market stands in five former Zeppelin hangars.

The statue of a legendary giant who carried Christ and shouldered the world's sins.

This seaside pine grove features an exclusive watchtower that presents amazing views.