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

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

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

A marvel of Byzantine engineering under the streets of Istanbul.

This building holds the embalmed remains of the leader of the Bolshevik Revolution.

A 250-year-old timepiece-automaton adorned with golden mechanical birds, which still sing to this day.

Once swallowed by flood waters, this village has emerged as an eerie shadow of its former self.

Because sometimes the most efficient route from A to B isn't a straight line.

A series of waterfalls so massive they straddle the border of Argentina and Brazil.

The bookstore with bookshelves built into unlikely places.

One of São Paulo's tight urban intersections has become a haven for graffiti artists ever since a single Batman started the trend.

This massive Brazilian church is built like an angular, technicolor pyramid left by Mayans from the future.

A 125-meter long "tribute to the Brazilian people."

The key to turning shifting dunes into the green oasis of Golden Gate Park.

Sacred waters rescued from the wrath of a volcano.

An abandoned hotel in the highlands of Bali is shrouded in stories of ghosts, curses, and corruption.

A haunting theme park is slowly being swallowed by the jungle.

The name of this ancient Indonesian temple translates as "Elephant Cave" but it could be more accurately called "The Hellmouth."