The spectacular geological formations make it one of the most impressive caves in Europe.

In pastoral England, a plaque marks where an imaginary community addressed the problem of combat mortality.

A retirement home for soldiers that can trace its history to the Elizabethan era and beyond.

One of the largest sculpture collections in the U.K. features history's greats, from Bob Dylan to Galileo, in bronze.

From Japan to Italy, this California park explores the world's cultures through their gardens.

One of the few remaining carousels built by master amusement park carver Charles I.D. Looff.

A neolithic tomb converted into a tiny chapel.

Living towers made of people that are now recognized by UNESCO.

Men in rubber-soled boots serve as your "brakes" on this toboggan ride Hemingway described as "exhilarating."

A submerged village appears when dam levels drop.

Spanning the El Chorro gorge, this pathway used to be one of the most dangerous crossings in the world.

A mythical garden that once grew the golden apples of wisdom is said to have existed in this ancient Moroccan city.

The verdant mossy ruins of a Franciscan monastery lie in the remote Sintra hills awaiting exploration.

This star-shaped military outpost is now simply trying to protect itself from neglect.

Pagan monument converted to Christianity with the population.

This crumbling Portuguese ruin overlooks the populace it once ruled.

Located in the Horniman Circle area, this church marks the historical Zero Point of Mumbai.

Considered the birthplace of the Copper Age and Bronze Age, the river is tinted red from 5,000 years of mining.

On a trail in Portugal's Barão de São João National Forest, a pile of faces look up at hikers from the forest floor.

Dead weights honor the dead of Portugal's fishing industry.

Only a fragment of this 15th-century Dance of Death survives today.

Spend your honeymoon where the Devil had his wedding.

A unique sculpture calls the outside of this steakhouse home.

A secluded art gallery hidden within the cellars beneath Tallinn’s medieval monastery.