One of the largest ochre quarries in the world, hidden in a limestone landscape.

The mental institution where Van Gogh created some of his most famous work now allows guests to walk in the artist's footsteps.

This ancient Roman town was revered for the healing waters of its sacred spring.

This ancient theater was once the home of fierce gladiatorial battles.

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

Visit a prison tower used during witch tribunals.

A once-thriving hotel in the Swiss Alps couldn't compete with climate change.

The alpine falls where Sherlock Holmes apparently met his demise can actually be visited.

The second-highest train station in Europe.

Visit Europe's largest subterranean waterfall, carved by water from the glaciers of the towering peaks surrounding the valley.

One of the highest emergency huts in the world has been waiting almost a century to give imperiled climbers a place to lie down.

This Swiss cemetery is reserved for people who died in climbing accidents.