One of the most studied Iron Age settlements in Europe.

Besieged by war, this castle ruin has crumbled into a peaceful picnic spot.

The first archaeological site discovered by aerial photography.

Soldiers carved these regimental badges into the chalk hills in remembrance of those who died in World War I.

Famously misunderstood wonder of the ancient world

This modest relic, with rich history as a strategic fort through multiple eras.

This gate served as a small lock-up jail in the 14th century.

Several Iron Age artifacts were discovered during excavations of this ancient site.

This church also serves as a lighthouse complete with a beacon.

A small island dotted with old, historic Finnish buildings.

This irregularly shaped sea fortress has defended not one but three different sovereign states.

The Hveragerði fissure runs through this unassuming shopping center.

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

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

A winding, blood-red tunnel of hardened lava navigable by foot.

An encyclopedic collection of mammal penises.

The unique waterfall in Iceland's south features a backdrop of geometric black lava columns.

Medicinal spa created from the mineral-rich runoff of a geothermal power plant

This spectacular dome managed to survive after being bombed in World War II, in an event known as the "Miracle of Mosta."

The middle finger of modernity.

Two stone columns flank the grand Venice square, but there were supposed to be three.

This community on a small Venetian island has taken to painting their houses in bright neon hues.

Go inside to really appreciate this 500-year-old technological masterpiece.

Pilgrimage site for star-crossed lovers.