These gigantic skeletons tower over visitors and provide insight into the creatures that once ruled over Ireland.

The 19th-century pharmacy (now a used bookstore) was featured in James Joyce’s "Ulysses," and has changed very little to this day.

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

The tradition of open-air secondhand and antiquarian bookselling in Paris dates back to the Renaissance.

Walk through spectacular aisles of hanging meat and wagon wheel–sized cheese at the world's largest wholesale food market.

The floorboard scrawling of a tragic madman is on public display outside a Paris hospital, much to the dismay of its opponents.

The water-powered carriages are long gone, but for over a century this funicular railway has been the fastest route to the highest point in Paris.

The history of radiation is on safe display at the foot of a radiation science laboratory.

This museum houses an imposing skeleton army comprised of creatures great and small.

This Parisian café sticks almost exclusively to an ethos of reuse.

A mechanized clock where a man fights off a dragon, crab, and rooster.

High atop the Eiffel Tower is a small apartment built exclusively to entertain the science elite and make the rest of Paris jealous.

One of the oldest medical collections in Europe focusing on rare surgical instruments.

This massive library holds what was once the largest book collection in the world.

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

Beneath the surface, something slithers. And if you find it, prepare to be slimed and glowing.

Hidden amid the old-world charm of Savannah is a museum dedicated to the world of oddities and criminal history.

Take a steam-powered ride straight out of the past on this Appalachian rail line.

One of the world’s largest collections of paper memorabilia chronicles 4,000 years of papermaking.

This "living building" on Georgia Tech's campus is home to a blueberry orchard, honeybees, and more than 900 solar panels.

North America's oldest authentic African Village.

The statues commemorate the legendary mass killing of escaped circus monkeys.

Thousands of jack o'lanterns light up Halloween at this historic West Virginia home.

Enormous lake at the bottom of a unique cave system.