When ecosystems collide in the arid Southwest.

Unlike most arches, this geological oddity formed in a volcanic dike.

A mural of the Virgin of Guadalupe painted on the rock wall by canyon's religious namesake.

Possibly the world's only drive-in movie theater with an attached motel.

The childhood home of Henry Jones Jr. is now an adventure-themed bed and breakfast.

An antique narrow gauge railway line still running through the Colorado and New Mexico mountains.

Gleaming self-built castle towers made from beer cans and inspired by "Vitamin Mary Jane."

This art deco masterpiece was once a miracle spring mecca but is now simply a government office building.

Two hundred tons of pioneer artifacts were painstakingly recovered from a shipwreck at the bottom of the Missouri River.

The "World's Largest Underground Business Complex," a 55,000,000-square-foot city underneath Missouri.

The site of the one of the most deadly train wrecks in American history.

This award-winning men's bathroom was just too beautiful to not allow women to see.

At 135 years old and counting, this historic print shop is heaven for poster nerds and music buffs.

This replica of the Greek structure is in the heart of Nashville.

A 1995 memorial acknowledges the tremendous contributions of Vietnamese refugees to Canada.

These locks on North America’s oldest canal are named after a porcine rock formation.

This inexpensive lodging house was once a prison notorious for its inhumane practices.

The mastermind behind this palatial hotel perished on the Titanic weeks before its grand opening.

Louise Bourgeois' 30-foot-tall steel spider sculpture.

Canada's subterranean Cold War museum has doubled as a movie set.

With 3,000 bikes on display, the world's largest bicycle museum includes some famous rarities.

Where the author wrote her beloved "Little House" books.

Four, 18-foot-tall badminton shuttlecocks lie scattered about the lawn of a Kansas City museum.

A 35-foot-tall fork stuck in the ground outside an office building in Missouri.