A lonely beacon, precariously perched atop a remote sliver of rock.

The final remnant of the Arkansas zinc industry is this historically protected ghost town.

Wall to wall taxidermy at Denver's oldest and most exotic steakhouse.

Every winter, the wind carves blocks of frozen water into beautiful abstract shapes inside this unusually curved tunnel.

An abandoned early-20th-century boomtown sits within the Calico Rock city limits.

Once an ambitious nature spa, these forest ruins now provide a serene monument to failure.

A 131-year-old wunderkammer of Texas history.

Remnants of a quarry company town still stand on the banks of the Wapsipinicon River.

During WWII the U.S. Navy conducted primitive drone strikes on this Lake Michigan lighthouse.

A former barn converted into a massive train diorama.

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

The only freestanding table rock formation east of the Mississippi.

A turn-of-the-century architectural marvel built on healing mineral springs and salt licks.

This family driveway also serves as the highest point in Illinois.

An enormous natural sandstone bridge in Kentucky.

A geological oddity formed by two rivers carving out a mass of limestone on both sides.

Museum dedicated to the art of cutting and polishing stones.

A warning to the weak-kneed: This narrow bridge does its swinging eight stories high.

The world's largest and most outstanding marl lake regularly changes color.

This large midwestern cavern features impressive rock formations and an underground waterfall.