The Door to Hell is an eternal fire that has been burning continuously since Soviet scientists lit it in 1971. Located in Turkmenistan, it's one of the world's weirdest tourist attractions.
The Catacombs of Paris are underground ossuaries that hold the remains of about six million people, most of which were relocated from cemeteries outside the city during a time when there was a lack of space for burials.
Belize's coast is home to the Great Blue Hole, a giant sinkhole. It was formed when limestone caves that were on the ocean floor collapsed, forming one of the largest Blue Holes in the world.
The Nazca Lines are located on a coastal plain of southern Peru. These ancient drawings can only be seen from the air and date back to 500 BC.
The Crooked Forest is a grove of oddly-shaped pine trees in Poland that are thought to have been created by human intervention. They were planted during the 1930s and scientists believe they were done so deliberately, but no one knows why.
Located deep within Seneca Rocks, West Virginia is a place of natural beauty and serenity. The Eternal Flame Falls has been burning for an estimated 20,000 years.
The Wave is a geological oddity located near Coyote Buttes North. It is the largest known of its kind, spanning over 600 feet across. The sandstone rock formation was created by erosion and has been shaped into a wave-like pattern.
The Magnetic Hill is a gravity hill located near Moncton, New Brunswick. It is said that when you drive your car on the road from Moncton to nearby Shediac, it will seem like you're going uphill.