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

Three columns of volcanic rock shoot out of the ocean.

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

Medicinal spa created with the discharge from a geothermal energy plant.

A haunting painting meant to capture the calamity of World War I.

Sculptor Antony Gormley used chaos theory and fractal growth to design his tallest creation.

The ritual has been performed uninterrupted for nearly 700 years.

The first tunnel to be dug beneath a river, repurposed as an art and museum space.

Charles Babbage's proto-computer, painstakingly brought to life.

19th-century scientists would make the pilgrimage here to verify the precision of their measuring sticks.

Six ravens are kept captive (but well-fed) at the Tower of London to prevent the fall of the Crown.

The remains of Crystal Palace Great Exhibition of 1851.

Hear the quietest sound from across the dome.

A 1,215-foot tunnel transports pedestrians beneath the River Thames.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the Harry Potter films.

At the time of its construction, this hydroelectric power plant was the largest in the world.

The burial place of 14 of the executed leaders of the Easter Rising.

This statue celebrating everyday life in Dublin has a few unsavory nicknames.

An enigmatic monument to the Irish revolutionary who plotted an uprising against British rule.

An Irish peat mine has become a stunning sculpture park.

Dublin's most modern, visually spectacular bridge is modeled after Ireland's national emblem.

See some of the world's greatest racing horses at this idyllic thoroughbred breeding facility and garden complex.

A restaurant with an extensive Irish whiskey bar also has several first editions of famous works by Irish authors.

The severed head of a 17th-century Irish martyr lies within an intricate golden shrine.