Collection of antique science instruments displayed in recreated 1870-1930 laboratories.

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

Mutant vegetables, transgenic mosquitos, and atomic rodents span the walls of this one-of-a-kind museum.

This naturally-sourced hot spring is now home to a clothing-optional resort.

Rustic natural hot springs in the deciduous rain forest.

One man has installed bathtubs into the Utah desert floor to harness the powers of a natural hot spring.

This lab's maddening silence is good for business but bad for sanity.

20,000 pieces in a Frank Gehry-designed building.

Eons old volcanic activity created one of the most stunning rock formations in the United States.

Once thought to be the oldest living tree in the world, Methuselah was germinated before the Egyptian pyramids were built.

While many places make the claim, the Library of Congress says this restaurant is the birthplace of the hamburger.

The oldest restaurant in the world is this old-world Spanish eatery, still known for its suckling pig.

Hub of Scandinavian culture in a Minneapolis deli.

This Art Deco fortress in upstate New York gives Manhattan's vaunted examples of the style a run for their money.

Canyon walls shrouded in ferns.

Surprisingly aquamarine waters fill deep lakes formed at the end of the last ice age.

A series of recreated fortifications mark George Orwell's path through the Spanish Civil War.

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

The official atomic museum of the United States explores the explosive and productive history of a much maligned energy source.

Holding multiple historical boats and an entire 19th century village, this New England attraction is the largest maritime museum in the world.

Once America's longest-manned military fort, now an abandoned hulk.

A Civil War fort in the middle of Washington, D.C. has been swallowed by a forest.

This Orthodox Church's exterior is rather unorthodox.

Wars fought and wars won are remembered by these abandoned bunker ruins.