This hidden collection of everyday objects illustrates life within communist Poland.

An expansive complex of subterranean tunnels is all that remains of one of Europe's most formidable medieval fortresses.

A vast Communist-era exhibition space in the Bulgarian capital.

The last bastion of Roman presence north of the Alps looms over a German town.

This private skyway is filled with art and was expanded explicitly so that Hitler could appreciate a river.

This medieval castle overlooking the Elzbach river looks just like it did hundreds of years ago.

Perhaps the most spectacular grotto along the Algarve coastline.

Spanish architects used seized Muslim gravestones to rebuild parts of the fortress.

The de facto symbol of Copenhagen is this bronze fairytale which cannot seem to keep its head for very long.

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

Four alabaster giants contemplate the tides on the shore of Denmark.

If a glacial river suddenly diving into a sheer chasm via a dramatic, multi-stage waterfall isn't peak Iceland, it's certainly close.

This valley of hot springs and boiling mud pots is home to the record-holding "Geysir," which originated the English word.

The picturesque birthplace of Icelandic democracy is drenched in the blood of its brutal past.

This stately estate house features a tower covered in a bright, modern mural.

This astonishingly geometric cave has inspired everyone from Jules Verne to Pink Floyd.

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

The fountain marks the area where hundreds of accused witches were burned at the stake.

A misnamed well, with a deep dark past.

These fantastically named natural pools look like something out of a Scottish myth.

Follow the original medieval paths that wind through this intriguing section of the city.

A musical instrument played by the sea.

Now harmless, this looming post struck fear into the heart of medieval troublemakers.

This gorgeous space is England's largest independent library outside of London.