This shale formation along the Appalachian Trail once inspired the third president of the United States.

Built in the 1850s, this church was of the first five churches constructed in Harper's Ferry.

The last holdout of a pre-Civil War rebel who took the matter of slavery into his own hands.

This advertisement for talcum powder was painted on the rock face and has since defied removal.

The childhood home of the Sultan of Swat is just a line drive away from Oriole Park at Camden Yards.

A priceless collection of the Nation's cryptologic history.

The Virginia farm where John Wilkes Booth met his grisly end is now largely forgotten.

This airfield is home to a number of retired vintage planes in various states of disrepair.

The world's largest vertical wind tunnel.

This Bogotá museum houses the world's largest collection of pre-Columbian gold relics.

Caves that can't seem to quit producing the remains of prehistoric humans.

The largest hewn stone in history.

A patchwork of ruins from various civilizations in one of the world's oldest continually inhabited cities.

An ancient capital city that dates back 3,000 years old and harbors many surprises.

This small roadside eatery exists in both the Northern and Southern hemispheres, as the equator runs right through it.

The busy transport hub is home to the tallest airport slide in the world.

A monument to the two U.S. officers killed by North Korean troops while trying to trim a poplar tree.

The site of many tense prisoner exchanges across the Military Demarcation Line between North and South Korea.

An optical illusion found amid a logged redwood forest.

A crumbling wizard is one of the final reminders of a roadside Middle Earth.

One of the most scenic stretches of road in America winds between some of the country's oldest trees.

An exquisite and eclectic selection of African masks stands out within a massive woodcarving marketplace.

This centuries-old tree tells an unusual tale of vegetation and fertility in the desert.

This indoor ski resort has a mountain contained inside a mall.