"We Seceded Where Others Failed."

Waterway populated with abandoned projects, including a submarine.

One of the few standing Roman lighthouses and a labyrinth of tunnels are a couple of the secrets at this historic castle.

The oldest restaurant in the world is this old-world Spanish eatery, still known for its suckling pig.

A wunderkammer of gold and silver reliquaries and ancient saintly bones.

The site of the deadly Triangle Shirtwaist Factory Fire.

San Francisco's urban bison herd has persisted in the face of extinction, development, and disease.

Jurassic Park—A Still Life.

Concrete strongholds stand guard over the Golden Gate.

Largest man-made excavation on earth!

Former villa and estate of James Deering developed to preserve native tropical forests.

An 18th-century Spanish watchtower made entirely of seashell and concrete.

Radioactivity still cause for concern at this urban explorer's paradise.

Nuclear waste dump site now an environmental sanctuary.

A monument celebrating the idea of reaching inaccessible places.

The original home of the Lego has a huge amusement park dedicated to the iconic plastic toy.

The famous boat that once ferried Bogart and Hepburn still floats in Key Largo after being abandoned for years.

Over 120,000 curious objects that have shaped our modern world.

Where monkeys run wild and the humans are caged.

A tribute to Ponce de Leon's supposed quest for eternal youth.

This dormant volcanic crater has been converted from a roiling pit of magma to a pleasant hiking spot.

Of course Salvador Dalí lived in a castle...

Spinning silently in the lobby of an Art Deco masterwork is a massive vintage model of the Earth.

Curious crustaceans support an obelisk from ancient Egypt that now stands in modern-day Central Park.