Iceland's first pagan temple in 1,000 years is underway in Reykjavík.

Every summer local children form "pysja patrols" to save young birds that have wandered from their nests.

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.

These secluded and abandoned anti-aircraft defenses have become one the most scenic viewpoints in Barcelona.

This cemetery features modernist statues as strange as its name.

Visitors can explore the role of mysticism throughout the ages inside this interactive museum of magic.

A secluded art gallery hidden within the cellars beneath Tallinn’s medieval monastery.

This medieval Estonian tower provides access to a series of tunnels that have been home to soldiers, punks, and fine art.

This former medieval prison now unlocks Estonia’s rich photographic history.

A subterranean house of worship carved right out of the bedrock.

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

A small island dotted with old, historic Finnish buildings.

17th century streets hidden under Edinburgh were once a breeding ground for the black death.

A 18th century graveyard and its astonishing cortege of macabre iconography.

A book bound in the skin of an infamous criminal, along with countless other specimens.

A statue in the heart of Edinburgh honors a bear that served in the Polish military during World War II.

A labyrinthine network of chambers with a storied past hides below Edinburgh's South Bridge.

One of downtown Berlin's last reminders of its Communist past.

This enchanting mountain plateau celebrates spooky local folklore.

Home to 10,000 medical specimens including the remains of Rudolf Virchow's extensive collection of pathological specimens.

The 20-mile causeway that separates the Netherlands from the sea.

The works of poetry's biggest names grace the walls of the city of Leiden, all carefully painted by hand.

It appears as if a man is standing behind this giant airport clock, painting the hands in real time.