The largest bell in the world has been swinging high above a Cologne cathedral for almost a century.

This 600-year-old home seems to defy physics.

Daily jousts and dancing barrel makers in Munich's mechanical clock.

Two stone columns flank the grand Venice square, but there were supposed to be three.

When a massive landslide hit one of the world's tallest dams it created a tragic environmental disaster.

The Emperor Tiberius' palace of debauchery.

One of the ghostly stops along Route 66.

Located on 420 acres in the high desert, this spiritual center is dedicated to the "science of the future."

The mysterious wonder of an underground waterfall is illuminated by multicolored lights.

This campus chapel is Robert E. Lee's final resting place and a topic of debate about the legacy of the Civil War.

A star fort along the C&O Canal in western Maryland that protected America in three wars.

This grave marks the final resting place of a legendary frontiersman... unless it doesn't.

Site of the 1879 Cheyenne Outbreak and the site where famed Sioux chief Crazy Horse met his fate.

A small town built on an abandoned airfield has former runways as streets and a bar and grill in an old airplane hangar.

This mining town boomed in the Atomic Age when uranium was gold, only to be abandoned when the industry collapsed.

This ultra-modern California span is actually a titanic solar clock in disguise built by famed architect Santiago Calatrava.

The unbelievably opulent home built for an infamous newspaperman.

This stretch of beach along California's central coast is a busy highway for the largest seal in the northern hemisphere.

The world’s largest concentrated solar plant generates as many problems as megawatts.

This golf ball–shaped former desert real estate office now houses a UFO museum.

A B-17 bomber stands as a memorial to the residents of Tulare County who served in World War II.

This abandoned motel doesn't welcome guests anymore, but decay and a creepy atmosphere still call it home.

Trails through lava-carved tube-caves display sparkling bacteria and a rich history.

This immigrant bridge once spanned the Thames but is now a fixture of an Arizona city.