Hundreds of thousands of concrete bunkers crowd Albania long after the fall of Communism.

What happens when you cross a mayor and a painter?

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

A massive yet whimsical statue pays homage to the art and joy of "flight."

An indigenous take on European design creates a stunning visual overload.

An Aztec temple, the largest man-made pyramid in the world, sits buried in earth with a Spanish church set on top.

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

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

A Mayan village preserved for centuries in volcanic ash.

The stoutest tree in the world.

Central America's deepest lake is actually a volcanic caldera, surrounded by three volcanoes.

An elaborate Mayan city shrouded in alien conspiracy revealed the tomb of Pacal the Great.

Baroque celebration of the end of the Great Plague of Vienna.

The final resting place for the remains of 143 Habsburg royalty.

The crypt of the imposing Stephensdom holds royal intestines and thousands of skeletons.

An 18-meter-long sarcophagus of a constantly growing dead prophet.

Where Stoddart and Connolly suffered in the infamous Bug Pit.

The Avenue of Mausolea is a series of grand palatial tombs.

This "tower of death" has acted as an observatory, a religious hub, and an executioner's lair.