The granddaddy of English geoglyphs dates back to the late Bronze Age.

A clock designed to run with perfect accuracy for 10,000 years.

Scattered throughout London are ancient remnants of the city's former bounding wall.

The curios of pharmacist and collector Henry Wellcome.

The anatomical-pathological collection of a man who changed surgery.

The fairy tale castle of the "fairy-tale king."

A hugely vast Irish landscape of barren rock that stretches for miles.

The sci-fi villain is a little-known inhabitant of the U.S. capital's largest cathedral.

The semi-reclaimed ruins of this canal were once part of an ambitious plan to reroute the mighty potomac.

Largest Roman Catholic church in North America.

A dramatic, 360-degree recreation of Pickett's Charge in the Civil War.

The tallest The Church of Jesus Christ of Latter-day Saints temple in the world soars above the Beltway.

The subtle science of a master molecular gastronomist.

Once one of the world's great cities, Cahokia was a place of religious worship, trade and mass human sacrifice before being mysteriously abandoned.

The quintessential Japanese rock garden has existed for more than 500 years.

Op-art architecture designed for happiness.

The final resting place for the remains of 143 Habsburg royalty.

A miniature city, once ruled by the Queen of the Netherlands.

Unsurprisingly, Holland is home to one of the most magnificent flower gardens in the world.

Berlin's old airport.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

The comedy and tragedy of Oscar Wilde is preserved in a Dublin park, captured in a sculpture of colorful stone.

The modern birthplace of Irish freedom.

Amidst the bustling streets of Dublin, there is a hushed garden that is dedicated to "All those who gave their lives in the cause of Irish Freedom."