At this Denver landmark, the meals are compulsory, the sopapillas are complimentary, and the insanity is everywhere.

Quite simply the largest tree in the world (by volume).

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

Etched into a dry lake bed, this massive directional indicator is accurate without magnets.

A museum celebrating the self-taught artist-environment builder.

The fifth tallest statue in the United States is a shirtless monument to the oil worker.

This constitutionally sound Muffler Man harkens back to the days these attractions were a must-see.

A walk through the historic city center, under the streets of Seattle.

This enigmatic building features numerous architectural styles.

Once a lonely sentinel on the edge of the Great Plains, this rebuilt trading fort offers a glimpse of life on the Santa Fe Trail.

Air Force Academy Chapel made of 100 identical tetrahedrons works to inspire those of all religions.

The haunted reputation of these abandoned Colorado train tunnels is probably not helped by the terrifying spiked fence.

This super steep hike ascends 2,000 feet in less than a mile.

The largest self-built castle in the U.S., six decades in the making.

Strange red rock formations that have been attributed to a higher power for hundreds of years.

The world-record holder for the longest bridge stretching continuously over water.

A 200-year-old building in the French Quarter that was to be Napoleon's home in the New World.

This down-home diner has been serving up comfort foods for over 100 years.

The last intact steam engine factory in the United States.

A cheeky alleyway window hosts tiny rotating exhibits with outsized charm.

A parade of interactive nostalgia nestled within a giant brick building in downtown Hattiesburg.