Slaughterhouse Five opens its dank doors to fans of Kurt Vonnegut.

A striking 12th-century-style castle built on the edge of a cliff.

Ruins of a German Castle on top of a towering stone pillar.

On the Spree bank, discover one of the last reminders of a symbolic wall that divided, and was torn down by the people.

The fairy tale castle of the "fairy-tale king."

This jaw-dropping 19th-century bridge uses its reflection to form what appears to be a perfect circle.

A creepy statue of a hooded ghost hauls itself up from the water in a historic Lithuanian city.

No one knows who built this strange cave of worship or exactly why.

This massive underground salt mine now holds a sci-fi theme park in its depths.

Moss and stone turn this waterfall into an otherworldly liquid veil.

This once-derelict building is now one of the most beautiful bookstores in the world.

A giant portrait of an ancient king looms over the river.

One of few vertical lava tubes in the world accessible by foot.

A small sanctuary carved into the mountainside near the tallest point in continental Portugal.

A deer-headed statue that brings together a 12th-century legend and big wave surfing.

This glass skywalk offers vertiginous views down the volcanic cliffs to the beach below.

A chunk of the "true cross" is held in this small Portuguese church where modern day exorcisms are said to be common place.

One of the world’s longest pedestrian suspension bridges.

A stunning 18th-century site where pilgrims ascend by a series of punishing stairs only to return via funicular.

Local lore says the devil built this beautiful medieval bridge to help a fleeing bandit.

When Azorean green tea meets volcanic hot springs water, a luminous brew is born.

In Portugal, a secluded stretch of untouched natural beauty hides at the bottom of a steep hill.

An early work of the architect Álvaro Siza Vieira, these swimming pools blend into the beach.

The medieval castle built as headquarters for the Pope's secretive Knights Templar.