A mineral spring that became all the rage in 17th-century England.

A relic of Victorian grandeur hides beneath a busy South London road.

A little slice of Japan and its aesthetics in London's Holland Park.

Remnants of a Victorian garden feature sitting in public woodland.

Rebuilt remains of a temple to Roman god Mithras.

Eighty million natural history specimens call this gargantuan museum home.

A 300-year-old tea shop that brought tea to the English people, not to mention the Queen herself.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the Harry Potter films.

A beautiful Greco-Roman structure houses a well once believed to have healing powers.

Tour the dark and beloved poet's former cobwebbed basement, which may have inspired "The Black Cat."

Arlington Cemetery exhibit dedicated to death and grieving.

Designed by Horace Trumbauer in 1893, this Gothic-style castle is now a home for academics.

It marks the spooky spot where the bodies of two young boys were found in the 19th century.

Disney World's very first waterpark is now an abandoned ruin being reclaimed by the swamp.

Disney's abandoned animal island is now an overgrown ruin that was almost the coolest attraction ever.

A local landmark with generations of spraypainted messages, and more being added each day.

This now-deactivated naval base defended the Florida coast for centuries.

The walls of America's oldest masonry fort famously "swallowed" cannonballs.

These crumbling foundations are all that remain of the once-stately 1840s manor that gave the town of Bradenton its name.

These former theme park figures have a new lease on life outside a water plant-turned-restaurant.

The ruins of a Florida miracle spring resort make it seem like a wonder that this was ever a health spa.

A building so large that it has its own weather.

A perfect circle of twenty-four mysterious holes dates back to prehistoric time.

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