Hide from the tourist hordes in these relatively unknown, and unguarded lava caves.

Two mammoth statues inspired by equally tall tales lure tourists to this roadside attraction.

Folk art crafted from discarded vegetable crates.

Humboldt's human-powered sculptures race across land and sea for days on end in a wacky quest for dominance.

The first life claimed by this record-breaking peak wasn't lost to exposure or a fall but rather lightning.

The tragedy of the Japanese internment camps is remembered here by a stark "Soul Consoling Tower."

A large instrument played by the wind.

This bridge was the birthplace of a unit of measurement based on a fraternity joke.

Ice cream stand, snack bar, and time capsule of milk conveyance.

The site of one of the strangest disasters in history—a wave of deadly molasses traveling at 35 mph.

One of the indelible moments of the American Revolution took place at this location.

A former waterfront market is now in the center of town due to some interesting Boston engineering.

This Nevada lake holds its titular natural pyramid and, if the legends are true, a number of dangerous spirits.

These once-beautiful historic graveyards are set against the barren Virginia City hills.

Beneath a Virginia City bar is the entrance to an abandoned gold mine.

By day this New Orleans square is for pedestrians, but by night it is a kingdom of kittens.

Oldest building in California still in use.

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.

Permanent exhibit reminds visitors of the Exxon Valdez.

The "world's biggest dinosaur" once housed a creationist museum in its abdomen.

Thousands of turbines whir at at the origin of North American wind power.

A vertically floating hemlock controls the waves and weather at Crater Lake.

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