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Northern Ireland's Brobdingnagian stepping stones.

An ancient Scottish rock formation said to be the gravesite of a giant remains ensconced in legend and intrigue.

A strange rock with a sinister reputation lurks within the crimson waters of this Scottish glen.

An unusual round church in London with a Templar past.

The atmospheric road was never meant to be so creepy.

Winding paths and ramshackle mausoleums in the oldest "park cemetery" in London.

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

Featured in one of the most iconic scenes in cinema history.

The dining hall that nourishes workers in Chernobyl's Exclusion Zone is also open to visitors.

The largest underground lake in Europe.

One of the most poignant ruins of the Chernobyl nuclear disaster, the local football team's stadium has been quickly reclaimed by nature.

The idyllic island where the philosopher Jean-Jacques Rousseau spent “the happiest time of his life.”

This memorial commemorating fallen Swiss Guards of the French Revolution has been called the saddest stone in the world.

This is not only one of the oldest collections in Europe, but also possibly the most beautiful.

From Coke II to Google Glass, this exhibit features some of the most spectacular commercial flops.

For decades, these ships have been lying in rust awaiting a final decision on their fate.

A geological wonder that helped fuel myths of trolls and giants.

An illuminated manuscript comprising the life's work of a lone monk, inexplicably decorated with a portrait of Satan himself.

Replica of Seville, Spains famous Giralda, a former minaret converted into a bell tower.

The 20th-century church looks like a rustic version of the Sagrada Familia.

An iconic photograph from the Spanish Civil War saved this shrapnel-scarred historic house from destruction.

This magnificent market stands as a poignant symbol of the suffering caused by the Spanish Civil War.

This multi-level, aqueduct-footbridge hybrid is one of the greatest works of the Spanish Renaissance.