One of the oldest Catholic churches in the U.S., situated just east of Gettysburg.

The world's first nuclear power plant is open to visitors looking to role-play a meltdown.

Home to the deepest rift anywhere on Earth.

Supposedly Satanic numbers adorn this preserved submarine sail.

The largest hot spring in the United States is, as the name suggests, a stunning show of natural color.

An architect's childhood fantasy treehouse made real.

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

A beautiful geyser under environmental threat.

This Yellowstone geyser may not shoot as high as the nearby Old Faithful, but it erupts for considerably longer.

The only natural lake in the world that drains into both the Atlantic and Pacific Oceans.

Where the famed daredevil attempted to launch himself across a canyon in a custom-built rocket.

At Washington's Dulles Airport is a satellite museum (no pun intended) with three quarters of a million square feet of aircraft history.

Exact replica of the ancient monument, but much, much lighter.

The resting place of a Civil War celebrity's amputated limb.

An impressive collection of over 50,000 minerals including moon rock from the Apollo 17 mission.

Come for the speed, leave in love with the desert.

The giant pair of sexy legs sticking out the window of this costume store have become its main draw.

Relics of the 1894 Midwinter Exposition continue to delight visitors today.

A hidden gem, named after a San Franciscan icon, offers spectacular views of the Pacific Ocean.

A walk-in working camera obscura produces 360-degree live images of the San Francisco coast.

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

Built for an exposition in 1915, these horticultural displays have stood the test of time.

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

The angel of death appears to weep black tears at this grave marker.