The only remaining Cold War–era Minuteman II missile control center in Missouri.

This elegant arc of a waterfall marks a religious turning point.

Site of James Cook's historic observations of the 1769 transit of Venus.

This landmark cemetery in Boston was created more than 300 years ago.

The site of Paul Revere's historic two lantern warning.

Macabre headstones carved with winged skulls, dancing skeletons, and pithy reminders of impending death.

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

At 207 feet, one of the world's longest continuous escalators.

A traveling postal dog covered 48 states and more than 140,000 miles, and he lives on as taxidermy, patched up with a rabbit's foot and a pig's ear.

The "lovely red Vega" of the legendary record-settling pilot.

Equal parts record-breaking temple to consumerism and bizarre fun park, it's more than you think it is...

This secret gem of a toy store houses a rideable carousel populated with fantasy animals.

Ever wanted to can Spam?

When ecosystems collide in the arid Southwest.

The highest bridge in America was built for an almost unnervingly small amount of money.

The largest source of fossilized insects anywhere.

A full-size replica of this well-preserved temple lets you take a walk through the Mayan age.

This staircase full of Mayan hieroglyphics is perhaps the largest single text in the world.

These colorful sawdust illustrations are trampled into non-existence only moments after they are finished.

A building so large that it has its own weather.

A sacred site for Native Americans surveyed by George Washington and owned by both King George III and Thomas Jefferson.

An organ located deep within a cave, whose "pipes" are the geological features of the cave itself.

The last holdout of a pre-Civil War rebel who took the matter of slavery into his own hands.

All of the 20 occupied houses in this mostly abandoned town feature some curious display of junk art.