This medieval oratory decorated in magnificent frescos was constructed after Charlemagne received a vision.

This medieval sanctuary's tree-framed door looks like a portal to a mythical realm.

This fresco-covered medieval monastery hangs from the side of a steep cliff.

This 7,000-year-old megalithic wonder covered by a Franco-era reservoir emerges in times of drought.

The beautiful bas-relief lines a sliver of a 19th-century walking path between two charming French villages.

Centuries later, the victims of Great Britain's greatest hysteria are finally being remembered.

A statue of the legendary Celtic warrior queen who fought the Roman invaders stands in one of the cities she once destroyed.

This functional solar system model was inspired by the famous Eisinga Planetarium.

The old church, buried by the 1784 Mount Vesuvius eruption, is a remarkably well-preserved place where people now pray for the souls of the dead.

Nibble as you learn about Slovenia's longstanding tradition of making beautiful honey cookies.

A well preserved medieval fortress in Vojvodina.

Legends of treasure and spirits flow from this this fairy tale-like oasis.

The interior of this Serbian royal family's mausoleum is covered with exquisite mosaics.

A small but charming botanical garden that contains many exotic plant species.

This cheese shop also houses a museum devoted to Dutch dairy.

This ancient fort overlooks the site of a disastrous retreat from the English Civil War.

This observatory within Europe's first dark sky park offers stunning views of the night sky.

This amazingly well-preserved villa just outside Pompeii boasts rare examples of ancient Roman paintings.

This 15th-century Serbian Orthodox monastery also contained a school for illuminating manuscripts.

Berliners converted a bombed-out, disused lot into a community-run urban farm with its own cafe and bar.

The largest greenhouse in the world is home to over one million types of plants.

Miles of man-made caves and tunnels are currently used for cultivating mushrooms.

The world's first underground farm is in a World War II bomb shelter beneath the streets of London.

Once frequented by heavyweights of the Russian arts scene, this café is stuck in the 1800s.