Unparalleled stargazing, one of Colombia's best observatories, and a swimming pool can all be found in the middle of this ancient tropical forest.

Walk behind a 50-meter-high waterfall.

A 200-year-old collection of medical paraphernalia in a historic house.

The northernmost point in Denmark is a turbulent sandbar created by two clashing seas.

Vortex-shaped aquarium hosts Europe's largest school of piranhas and other ocean creatures.

This chimerical bridge/tunnel appears to dead end right into the sea.

The de facto symbol of Copenhagen is this bronze fairytale which cannot seem to keep its head for very long.

The ruins of this medieval castle in Northern Ireland have inspired artists from C.S. Lewis to Led Zeppelin.

Northern Ireland's Brobdingnagian stepping stones.

Mortarless walls that stretch for miles are a lovely solution for creating grazing land in the harsh terrain of the Aran Islands.

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

An Irish church where an 800-year-old mummy is reaching out of his coffin as if to shake hands.

The oldest licensed distillery in Ireland.

The oldest pub in Ireland may also be the oldest surviving bar in the entire world.

The oldest inn in Kilkenny was established by the first convicted witch in Ireland.

Longest road tunnel in the world features an air treatment plant and the illusion of daylight.

Walk 2,300 feet above the ground on the "Troll's Tongue."

Tens of thousands of tiny bottles stuffed with various items.

From buck blood to Theriak miracle tonic, this collection of Renaissance chemist's gear look's like a wizard's pantry.

Over 9,000 brains collected between 1945 and 1982 demonstrate the results of untreated mental illness.

This colorful artistic feature atop a Danish art gallery allows visitors to stroll through a rainbow.

Iron Age "bog person" preserved for over 2,300 years.

The original home of the Lego has a huge amusement park dedicated to the iconic plastic toy.

A Natural History and Science Emporium.