A 16th-century horror show built in a lovely Italian garden.

Breathtaking and huge 430 year old maps of Italy.

Medieval torture techniques with a modern conscience.

Over 50 exquisite hand-painted Renaissance maps decorate a Medici storage room.

A climbing route in the mountains of Italy’s Dolomites, built for soldiers during World War I.

The highest waterfall in Italy is only "turned on" five times a year.

An open-air museum in a mountain valley features works designed to blend in with—and disintegrate back into—their natural surroundings.

This winding road through an Italian canyon may be the most scenic drive in the world.

This Italian foot path winds through the mountains via 52 individual tunnels.

Vast network of air raid tunnels beneath Lombardy's capital.

The only natural lake in the world that drains into both the Atlantic and Pacific Oceans.

Nationwide network of co-ownership underground catastrophe shelters.

An underground mansion with fruit-bearing trees and grapes growing beneath the surface of central California.

This medieval village/restaurant perpetually celebrates the year 1376.

Railways may have forged this quintet of lovely tunnels, but now they are open to hikers.

This long, dark tunnel is open to hikers, but those without lights are known to get confused even on the straight path.

A French chateau, failed utopian community, odd museum, and Stonehenge replica in rural Washington State.

An old world fairytale-land with over 350 fairy folk figurines hidden amongst 800 year old cedars.

Live long and prosper in Vulcan, Alberta.

This angular Dwarven tunnel cuts through a mountainside in Glacier National Park.

The rocks of a certain area of Butte, Montana give off a musical ring when hit.

See the computer’s history revealed over the course of 20,000 years.

This prison-turned-museum is a remnant of the Old West's grizzly, violent past.

These aggressively sustainable art homes look like something out of 1970's science fiction.