Daredevil repair workers can worm their way out the access hatch, loop ropes over the apex and rappel down the monument.

Each winter this underground cave forms a dazzling ice palace.

This rare surviving broch is one of Scotland's most impressive Bronze Age structures.

Bioluminescence in the reefs of the Maldives causes the sea to glow like a starry night sky.

This isolated island is often capped by its own fluffy cloud.

With nickel-steel armor and three-inch thick bullet resistant windows, FDR's train was a rolling fortress.

The 44,000-ton aircraft carrier was purposely sunk to create an artificial reef teeming with life.

A midcentury ranch house hides a literal treasure trove of unique rocks and minerals.

One of the cave cities of Crimea, built by the Goths in the sixth century.

An obscure public service from the U.S. government that redeems burnt, moldy, and soiled old greenbacks.

This Maryland farm is known for its amazing corn mazes and its 30-foot junkbots.