The unluckiest U-boat in the entire German fleet is now on display in a Chicago museum.

This $3 million model train takes you through Chicago, Seattle, and the thousands of miles in between.

This mysterious structure by the Washington Monument is a flood barrier designed to protect the White House against rising waters.

This scenic Maryland park was the site of one of the worst prison camps of the Civil War.

Captain John Smith thought these cliffs were amazing in 1608 but sharks thought so 20 million years before him.

A Civil War Museum with some notable medical antiques.

The most iconic structure in Scotland has been home to bishops, colonels, and Sean Connery characters.

Where the sleeping monsters of Scotland's oil industry are left to rust.

A beautiful geyser under environmental threat.

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

This spiny beast guards an artist's village while vying for the title of largest lobster in the world.

The world's only underwater laboratory where "aquanauts" study oceanic life.

Home of what was the largest hydraulic mine in the world, producing gold and the first diamonds in the U.S.

This giant shopping mall still holds signs of its automotive past.

The world's first permanently occupied mountain-top observatory continues to report on the stars.

From the sky, a kaleidoscope of color brightens the grey landscape of the San Francisco Bay.

A museum dedicated exclusively to aircraft used in the military.

Beautiful Gothic-inspired lighthouse stands out among the run-of-the-mill striped fare on Bodies Island.

This shifting North Carolina sand dune is an odd little desert surrounded by oceanic forest life.

The lowest point in North America is home to an undrinkable pool surrounded by fields of geometric salt flats.

This massive redwood tree has a hole in the base big enough to drive through.

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

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

San Francisco's newly reopened hands-on science museum.