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.

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 eye-popping Icelandic crater lake is surrounded by red volcanic rock.

One of the oldest family businesses in Reykjavík serves lamb-based hot dogs.

Erotic art covers the walls of the largest ancient pleasure palace.

Naturally formed rock city in Poland.

The walls and ceiling of this Polish church are decorated with thousands of skulls, with another 21,000 skeletons just below.

The Neapolitan Cult of the Dead still cares for the skulls at this mini-Fontanelle.

This shining multicolored metro station deep under Naples is said to be the most beautiful in Europe.

Although it appears ancient and mysterious, the quirky folly was actually built 200 years ago by an eccentric estate owner.

Harry Potter once visited this massive limestone cliff, which was carved by an ancient glacial river.

Relive a Polish uprising via an enormous, century-old cyclorama.

A 90-ton, gravity-defiant steam locomotive shoots for the skies in this bizarrely beautiful public artwork.

A striking public sculpture representing the period of martial law in Communist Poland.

In the center of Wrocław's old meat market stands a somber tribute to the city's livestock.

This ex-prison dates back to the Middle Ages.

The silly symbol for an underground protest group is now scattered around the city.

Inside this chapel, Victorian jailers took the separate system to new levels.

The largest oak in England is said to have been the hideout of Robin Hood and his Merry Men.

A gorge full of caverns where early humans lived alongside cave hyenas, giant mammoths and wooly rhinoceroses.

A medieval relic whose great hall once hosted Mayflower pilgrims, one of Henry VIII’s ill-fated wives, and plenty of royal intrigue.

Legend has it the famous Robin Hood would attend mass at this 12th-century Cistercian abbey in Sherwood Forrest.

Mysterious stone faces line a hidden path great for seeing wildflowers, bird watching, and rock climbing.