After a short-lived attempt to bring America in line with the rest of the world, this road was left in metric.

A nature and cultural preserve named for its multitude of petroglyphs carved by the Northern Sinagua people.

The world's largest military aircraft cemetery.

Some of the tallest ancient American ruins continue to inspire awe and curiosity.

The world's largest rose bush has literally outgrown the pioneer museum it was planted behind.

Open since 1938, this diner has kept its fountain, malt machine, and all the gum that greasers left beneath its counter.

The block of aged dairy is probably still edible after 2,300 years in a peat bog.

Dublin's "Dead Zoo" serves as a window to Victorian museum design.

This permanent collection of preserved bodies taken from Irish bogs is one of the leading authorities on such morbid mummies.

The Grand Lodge of Ireland is one of the oldest in the world, full of fantastical, elaborately themed rooms.

Experience what life was like in Ireland during the Viking and medieval ages.

A nun spent 16 years painting the stunning Celtic mural that covers the interior of this WWI memorial.

A museum that cashes in on its infamous little people while teaching you a thing or two about the Irish fey.

An 80-year-old plane tree is devouring an iron bench at Ireland's oldest law school.

Two towns are linked by an engineering marvel masquerading as a boring suspension bridge.

This pirate-broadcasting-tower-turned-restaurant played a rebellious role in the history of Dutch television.

This basement museum explores the art and artistry of fascism.

Two gravestones clasp hands over the religious divide.

This hidden collection of everyday objects illustrates life within communist Poland.

In the summer, the area around this sculpture transforms into a vibrant concert venue.

These 18th-century paintings of Warsaw were used to reconstruct the city after World War II.

A delightful museum entirely dedicated to the tiny homes of dolls.

A tribute to the Polish insurgents who fought in the failed attempt to end their city's Nazi occupation.

The world’s narrowest house makes for an awkward, four-foot-wide living space.