Modern technology and live displays tell the story of the Pacific during WWII for the Internet generation.

The artist James Turrell is repurposing an extinct volcano crater as an observatory to experience the cosmos.

This prison-turned-museum is a remnant of the Old West's grizzly, violent past.

The world's largest man-made underground caverns offer unparalleled underwater wonders.

Long before guestbooks and hotels, frontier travelers signed their names on this rock face.

A popular swimming hole that hides one of America's most deadly diving spots.

A decaying concrete oil tanker served as a disposal location for bootleg hootch.

A lighthouse built to save lives that took quite a few with its treacherous location.

A clear blue swimming hole with hidden caves, still unexplored.

The ruins of the castle that chemicals built.

This former stomping grounds of the most eminent astronomers of the early 20th century.

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

America's smallest town is run by its single citizen/mayor/librarian/bartender.

It should come as no surprise that the best view of the Hollywood sign is from Batman's lair.

A monument to the egos of two railroad magnates that fell into decline along with their careers.

The mysterious round rocks of Schooner Gulch.

A futuristic temple of light uses prisms and rainbows to create an atmosphere of peace.

These Great Lakes sea caves accessible by boat in the summer turn into temples of ice reachable by foot in the winter.

Natural sonic phenomenon comes with a grisly legend of murder and blood.

Once an ambitious nature spa, these forest ruins now provide a serene monument to failure.

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

A whimsical monument marks the highest point in Kansas, not that you could tell by the looks of it.

This dormant volcanic crater has been converted from a roiling pit of magma to a pleasant hiking spot.

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