The discovery of this Neolithic settlement, which contained a Stone Age "cathedral," threw archaeologists for a loop.

The Arctic Circle runs through this isolated spot north of Iceland.

A hermit's tiny cell built into the cliffside that saved him in South Pembrokeshire.

A perilous medieval road leading right into the sea.

A distillery built on (and above!) mobster Dutch Schultz's Prohibition-era underground moonshine business.

The abandoned grounds and derelict greenhouses of this once-magnificent Edwardian estate are now a nature preserve open for exploration.

This dramatic landscape hidden on the Isle of Skye looks as though you've stepped into the magical realm.

A 70-foot-deep ice cave formed by lava from Mt. Fuji on the edge of Japan's "Suicide Forest." 

The bones of some 7,000 soldiers killed in the historic Battle of Solferino are stored here.

One of the most breathtaking railways in Europe also takes one of the steepest climbs, from fjord to mountain plateau.

Possibly the oldest church in Barcelona, this basilica has its pagan and Christian mythologies all mixed up.

The great Danube river starts here.

The medieval castle built as headquarters for the Pope's secretive Knights Templar.

This large midwestern cavern features impressive rock formations and an underground waterfall.

The first Russian Orthodox church in North America and an Alaskan landmark.

The hill that gave the Massachusett tribe, and later the state, its name.

Britain’s longest ancient monument, this great 8th century earthwork was built to mark the boundary between what would become England and Wales.

An Anglo-Saxon cross inscribed with possibly the oldest written work of English literature.

Walk through Czech history in Prague's largest graveyard.

A hidden gem of a saloon in the middle of a ghost town.

High in the Rockies the third largest statue in the U.S. opens her welcoming arms, and lights up the night sky.

Remnants of cells from the most notorious London prison may lie in the basement of a rare Victorian Gin Palace.

A little-known memorial to servicemen and nurses killed in the line of duty during the First World War.

Formerly secret, precariously perched boulders.