This massive Roman Catholic rosary is composed entirely of wood.

Go inside to really appreciate this 500-year-old technological masterpiece.

One of the tallest bell towers in Italy plays a particular melody at just two times each day.

Historic fortifications form the boundary of Vatican City, but it’s not entirely surrounded by walls.

The world's longest known cave system.

This simple, broken column marks the final resting place of one of America's most famous explorers.

The drama of nature in full effect in this Nevada State Park.

A Norwegian-born sculptor created these soaring guardian angels at the entrance to Hoover Dam.

Dyed by iron oxide over centuries, these sandstone rocks rise thousands of feet into the sky.

Water of undetermined depth has attracted rare fish and cult leaders alike.

Large tower used for simulating radiation of Hiroshima bomb and the tallest object ever relocated.

Potential high level nuclear waste storage site for the next 10,000 years and beyond.

A picture-perfect town, perfect for blowing up.

The largest man-made crater in the U.S. marks the spot where we once tested mining with nukes.

A pocket of jungle amidst urban expansion in Panama.

A magically clear, blue river that seems to spring from nowhere.

Iron Butterfly's personal collection of footwear.

A patch of Philippines forest devoted to saving the lives of an emotionally sensitive species of googly-eyed primates.

This holy site either displays a centuries-old cross or a complete fake.

A small statue of child Jesus given by Magellan in 1521

Bohol's mysterious brown hills.