The scuba diving training facility was named for the steam that rises from the cave's chimney.

A historic Civil War estate-turned-museum looks back on the Confederate States of America.

A mysterious find dredged from Louisiana waters.

The state's oldest continuously operating museum houses more than 5,000 Civil War artifacts.

This Arizona observatory is famous for investigations into Martian life, and as the place humans first spotted Pluto.

The wreckage of a deadly bomber plane crash can still be found near an Arizona peak.

America's only nuclear missile silo open to the public.

The world's largest military aircraft cemetery.

A motel dedicated to Southwestern nostalgia.

Stepping away from the glitz of mobsters and casinos to learn about the other history of Vegas.

The neon signs from Las Vegas' past find their final resting place at this unusual graveyard.

A picture-perfect town, perfect for blowing up.

The abandoned "Red Star Train Graveyard" is the final rusting place for precious artifacts of train history.

Only museum dedicated to women pilots, with personal artifacts from Amelia Earhart and other aviatrixes.

A mysterious castle built as a monument to lost love.

Interactive modern and vintage submarine equipment, World War II relics, and submarine attire.

Built in just a little over a week this preserved bunker was created to protect our most attractive POTUS while he was on vacation.

Gutted airplanes slowly decay in a Florida field.