The grandiose interior of this bar speaks to its past as home to famous jewelers and railway offices.

This museum collects over a century of automobile history including the iconic car from The Muppet Movie.

River pirates, murderous bandits, and serial killers used this Illinois cave as their debauched hideout.

Odd, decrepit fountain honors Chicago author who had mixed feelings about his hometown.

This historic house museum that celebrates one of the world's most influential social reformers is also one of the most haunted locations in Chicago.

A limb from Indiana's largest sycamore tree on record.

One of the most popular megalithic sites in Ireland stands as a humbler version of Stonehenge.

This floating garden in the sky is straight out of a fairy tale, but the real thing is nothing short of magical.

This Irish museum in a historic 19th century market pays tribute to the glory of butter.

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

Famously misunderstood wonder of the ancient world

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

The watery entrance for condemned prisoners heading to the Tower of London is still visible along the Thames.

Ancient human remains unearthed around the iconic monument.

A 16th century chapel decorated with bones, skulls, and entire bodies hanging from the wall.

Less a museum than a bizarre fantasy world created by artists and engineers.

A sprawling maze of used books piled from floor to ceiling.

The oldest public library in Ireland.

More than 5,000 artifacts donated by the people of the city, plus a room entirely devoted to the band U2.

In an alley not far from where two great highways meet, byways of a very different sort are honored.

In a grove of fast growing walnut trees outside Paris, Illinois, a marker shares the story of a fictional road building culture.

One of the first historical sites of an alternative universe was installed in the town of Paris, Illinois—which is now home to an annual spelling bee of Kcymaerxthaereal words.

Only through the lens of a microscope can visitors see the true treasures inside this museum.

A tribute to Ponce de Leon's supposed quest for eternal youth.