Full-sized barn houses many restored instruments.

A battle between nature and architecture in the Cambodian jungle.

A monument to the center of the North American continent may be off by a few miles.

The prototype for all Nazi concentration camps.

The most visited, and possibly most controversial, museum in Germany.

17,400 lbs., 12 feet in diameter, and 29 years in the making.

A gothic church spire sits atop this skyscraper, the tallest church in the world.

A 6-mile-long lake created by an apocalyptic seismic event and the deadly chain reaction that ensued.

A beautiful geyser under environmental threat.

One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.

This structure among the trees was the result of divine inspiration.

An abandoned quicksilver mining town surrounded by the Big Bend parks.

A bronze statue dating back as far as 1252, still has remnants of gold on its right cheek from ancient gilding.

Memorial to the father of the Republic of China.

Explore this massive series of 45 caves and over 51,000 sculptures carved from cliffsides in China.

A mysterious castle built as a monument to lost love.

Half-sized replica of the Leaning Tower of Pisa built to honor Galileo.

The home of 1.5 million wood letters for printing is still a functioning workshop.

The seawater playground of gilded-era San Francisco burned to the ground in 1966.

The "world's biggest dinosaur" once housed a creationist museum in its abdomen.

Not merely a museum – but a whirring powerhouse that offers a subterranean peek into the heart and soul of cable car operations.

Explore 10 acres of environmental sculptures.

A hand-built folk art installation covered with messages of God's love.

The ghostly remains of an accidental sea.