This abandoned iron furnace was one of the first to use coke—a type of high-carbon fuel—to make iron.

Construction uncovered this trove of fossils, which visitors are welcome to add to their own collections.

Only 68 people per day are allowed to visit this New Zealand bird-watcher’s paradise.

Where manatees are the snowbird vacationers in these balmy Florida springs.

The superstar of Cold War nuclear bunkers has been featured in countless films but is now barely operational.

This abandoned island off the Venetian coast has been a radical monastery, a political prison, and a secret Nazi base.

These remote Florida islands have a history of sea turtles and sunken treasures, and one of the world's largest coastal brick fortresses.

An abandoned whaling station on an active volcano offers hot springs in Antarctica, surrounded by ruined giants of industry.

A small island less than half a mile from Venice is a forbidden island with a dark and twisted past.

This magnificent natural sandstone bridge is one of the largest in the world and is an iconic symbol for Lake Powell.

When the town wouldn't allow the fast-food behemoth to build a new restaurant, they put one inside an 1850 home.

Take a steam-powered ride straight out of the past on this Appalachian rail line.

The world's largest fully steerable radio telescope.

The marker offers a rare chance to be in four U.S. states at once, though there's some controversy over its geographic accuracy.

The ancient dwellings of the Puebloans, located in the cliffs of majestic mesas.

An eccentric priest's tribute to George Washington, this chapel tells the story of the American Revolution.

The American Revolution was galvanized into serious action due to the tragic clash with British soldiers that occurred at this location.

Just outside the Naval Academy, Hell Point is a historical marker that could easily be the point where failed students wait for the bus.

This Annapolis home was built by one of the signers of the Declaration of Independence.

This statue honors the author's groundbreaking family story.

Rediscovered after a century, the father of the American Navy was reinterred in something dredged up from Davy Jones' Locker.

The yawning maw of this pagan visage is said to bite off the hands of liars.

The watery grave of an impractical idea.

The longest staircase lock in Britain.