The site of the first battle of World War II.

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

Where America's first doomsday cult awaited the end of the world.

This sprawling concrete suburb of Kraków was designed by the Soviet Union as the model proletarian city.

This spire on an Austrian mountain is wrapped around a long spiral slide and has the world's tallest wooden observation deck.

A meteorite-bounded town in Bavaria.

A quaint medieval millhouse hovers surprisingly above the waters of the Seine.

These remote Florida islands have a history of sea turtles and sunken treasures, and one of the world's largest coastal brick fortresses.

This picturesque view of the Scottish Borders was beloved by Sir Walter Scott.

Walk 2,300 feet above the ground on the "Troll's Tongue."

A series of modernist treehouse hotel rooms grace the outskirts of an Arctic forest.

Ancient burial grounds of the wealthy.

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

It houses the remains of a 17th-century version of the Titanic.

Local legend says that whoever burns down this 2,000-year-old tree will only have seven days to live.

This small shrine is dedicated to the designer of the first Russian fighter jet and his brother, who became Chairman of the Presidium of the Supreme Soviet.

Unusual building appears to be haphazardly built from randomly piled bricks.

A fiery crater has been burning in the Karakum Desert since 1971.

Rusting ships sit in a desert where a sea used to be.

World's oldest and largest space launch facility, once a secret missile testing site.

Believed to have once stored either human remains or rice wine, thousands of mysterious stone jars lie in ruin.

A nightmare for the claustrophobic lies hidden in Southeast Asia.

Khmer Rouge's high security prison.

Home to some of the oldest hominid fossils ever found.