A unique set of caves that spits waves back out into the ocean.

A glass display case holds the document that ended the Second World War—which one person signed on the wrong line.

The air force base preserves its scars from the Japanese attack on Pearl Harbor.

Twenty-seven massive radio antennas on the high plains of New Mexico search for life on other planets.

This quirky hot springs town known to locals as "T or C" was named after a radio show.

Twice a year, visitors can tour the desolate site that birthed the Atomic Age.

Home of the International Space Hall of Fame.

This is one really big nut.

Explore the largest pure gypsum deposit in the world, and go dune sledding while you're at it.

A museum dedicated to the alleged Roswell Incident.

The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

The highest point in Texas is capped by a big silver pyramid.

Buy your friend a drink or staple some cash to the wall for the next guy at the Salty Dawg Saloon.

Clean, cold drinking water flows from a nondescript pipe in a roadside rock face.

Considered by many to be one of the most dangerous highways in Alaska.

This Alaska library may be the only one in the country that allows you to check out pieces of taxidermy.

A high school astronomy enthusiast designed this model of our solar system to be traversed on foot.

At this Minnesota state park you can easily wade across the source of the mighty Mississippi.

An ivy-covered arch bridge dedicated to Tejano music singer and legend Rosita Fernandez.

Craggy concrete faces are hidden in the walls of this artificial cave along the San Antonio River.

One of the oldest Mexican restaurants in the United States air-dries its trademark beef in a dangling outdoor cage.

This bomb shelter-themed bar has barely changed since it opened.

Texas's oldest bakery serves authentic German pastries, including legendary strudel.