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

An opulent monument built for a duke who donated his entire fortune to the city of Geneva.

Over 3km of caverns and caves at the Switzerland-France border contain the largest underground river in Central Europe.

This ancient Roman bridge and aqueduct still stands as a wonder of classical construction.

God's Saharan sandbox of wrath.

Within the Dadès Gorge, amazing vistas and towering cliff faces can be seen at each new curve and bend in the road.

One of the most spectacular canyons in the world.

The world's largest concentrated solar power plant.

World's largest film studio, where visitors tour the decaying sets that litter the harsh desert environment.

A mud brick kasbah with a history of lavishness and traitorship.

A fortified city, home to a remaining population of five families

It took 40 years to build this Eden-like garden in Marrakech, later restored by Yves Saint-Laurent.

The oldest monument in Marrakesh and the city's only surviving example of Almoravid architecture.

Fortune tellers, snake charmers, poets, and storytellers all gather on this historic square in Morocco.

A spiralling hourglass-shaped tower rises from the forests in Denmark.

A Chinese meditation center in the middle of rural Sweden, partly funded by a member of ABBA.

This former peat factory was transformed into an observatory before being abandoned once again.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

A cluttered and astounding collection of antiquities and curiosities.

A larger-than-life statue of the German revolutionist stands proud in a small town where he never lived.

Macabre astrological automaton clock dating to the late 1400s.

Bullet holes in the church wall are a reminder of the violence that followed the assassination of a high-ranking Nazi officer.

One of the most breathtaking railways in Europe also takes one of the steepest climbs, from fjord to mountain plateau.

A favorite with sightseers, this Norwegian funicular provides easy access to a stunning view of Bergen and its environs.