Hidden in an Italian forest is a completely homemade amusement park that has taken a lifetime to create.

As can be expected from a centuries old church built in a canal city, the undercroft of this house of worship is beautifully flooded.

This Venice bookstore has resigned itself to constant flooding by keeping its books in bathtubs and boats.

A haunting collection of sunken wooden barges litters this Italian river bend.

Crumbling ruins of the thermal baths that once attracted royals and aristocrats from throughout Europe.

These delicate sand pyramids look like naturally occurring gothic spires.

In this brilliant blue spring in Germany, legend has it that a sad mermaid learned to finally laugh.

Portugal’s highest lighthouse has one of the most impressive focal planes in the world.

Men in rubber-soled boots serve as your "brakes" on this toboggan ride Hemingway described as "exhilarating."

Behemoth, cannon-like telescope operated by generations of Irish earls.

The world's tallest church tower reveals a spectacular view to anyone up to the task of climbing the daunting staircase.

The last bastion of Roman presence north of the Alps looms over a German town.

A memorial for a young woman and her ghost, which are claimed to have caused countless deathly shipwrecks.

Legendary site where an evil bishop was devoured by rodents.

A tiny chapel clings to a precipice above Germany’s gemstone capital.

A rare water-powered funicular, it uses a huge tank of water and gravity to do its work.

A stunning Victorian abbey and walled garden on a lakefront.

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

These imposing walls and towers look more like the ruins of a fortress than a monastery.

This singular Irish dolmen is more Frank Lloyd Wright than upright stonehenge.

This controversial Irish show cave is home to a massive formation known as the Great Stalactite.

This ancient Irish religious site is covered in ancient carvings, many of which have barely aged.

Ireland's most remarkable collection of these curious cone-shaped houses is worth the buzz.

The bizarre visions of H.R. Giger, tucked away in a Swiss medieval city.