Descend into the tunnels to experience the life of a coal miner.

The site where one of the most famous poems of World War I was composed is preserved to honor the legacy of the work.

In an area where the remnants of WWI are discovered on a regular basis this preserved frontline trench may be the most amazing.

An open-air sewer system that was covered piece-by-piece over 300 years.

Cozy basement bar sports an inventory of over 2,000 beers.

This famous city eluded concrete detection until the early 2000's.

High atop a Mexican rainforest mountain, this ancient pyramid once drew pilgrims countries away.

A centuries old castle atop a dormant volcano houses museums devoted to both women and witches.

A Nesting Doll of Churches.

A rocky Irish outcropping with a history of wealth, conflict, and ruin.

This 14th century castle withstood years of battle but is now sliding off the hills into the Danube.

This statue was given to France by the United States to commemorate the centennial of the French Revolution.

A remarkable geological formation resembling a forest made of stone.

An easily overlooked stretch of ornate window fronts and gaslight lamps that could be right from the pages of Dickens.

The remains of what was, not so long ago, the world's largest city.

The famous winding walk at Chartres is surrounded in mystery and myth.

The largest underground church in Europe.

Thirty creepy ghosts now inhabit this decaying 14th-century church.

Danish tourist destination well known for open stalls where vendors sell marijuana on the street.

Two small chapels housed inside an ancient tree.

A striking 12th-century-style castle built on the edge of a cliff.

The oldest inn in England served brew to the crusaders.

Explore the complex ecology of this multifaceted nature preserve by riverboat.

Despite time, colonization, and the brutal New Mexican heat, these Pueblo ruins still stand.