The "Seinfeld" diner.

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

Iceland's largest lagoon is home to stunning multi-colored icebergs.

The hike through a narrow river flanked by the 2,000-foot-tall walls of Zion Canyon is one of the best in the world.

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

A beautiful geyser under environmental threat.

The first declared National Monument in the United States.

Tokyo’s only Vaudeville-cuckoo clock–steampunk-Victorian curio cabinet time piece.

The deepest lake in the United States, and once the site of epic destruction that lives on in legends.

Paranormal experiences in this hotel's room 217 led Stephen King to write "The Shining."

Macabre astrological automaton clock dating to the late 1400s.

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

Cabaret where the show girls are all androids, and the patrons couldn't be more pleased.

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

Medicinal spa created with the discharge from a geothermal energy plant.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

Dramatic river bend surrounds a natural red-rocked pedestal.

On the Oregon coast there is a natural hole that seems to be draining the sea.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

Frank Lloyd Wright's most iconic home dangles over a Pennsylvania waterfall.

The king of U.S. high points towers over every other peak on the continent.

Running under an entire mountain, the longest highway tunnel in North America is kept fresh using portal fans and jet fans.

This small city where almost everyone lives in the same building can only be reached via North America's longest tunnel.

This WWII-era military installation once held an entire city within its walls - now, its walls are falling down.