A hand-built folk art installation covered with messages of God's love.

Home to secret Eastern Bloc spy equipment and the largest stretch of the original Berlin Wall outside of Germany.

The wreckage of a tragic plane crash is on display at this museum devoted to a famous Italian conspiracy.

A small window on Via Piella offers a lovely and rare peek at Bologna's lost canals.

Discover for yourself what Herb Caen referred to as "the best kept secret in the Bay Area."

Across Ring Mountain is a vast collection of Native American petroglyphs unique to the region.

A working model of the entire San Francisco Bay and much of the Sacramento River Delta, complete with regular tides that change every 14 minutes.

Sitting on an Italian hilltop is this surreal fortress built by the mad inventor of electrohomeopathy.

Legend says this mysterious stone head belongs to a woman who was petrified by an alchemist.

The doodles of a genius line the walls of a secret room under the Medici Chapel, where they were hidden for nearly 500 years.

The bomb-ravaged remains of of a colossal Neptune.

This amazing medieval fortress stands atop a promontory along the famous Cinque Terre.

Five candy-colored villages on the Italian Riviera.

Anyone can control this glittery light installation with just a phone call.

A lover's walk between hilltop towns, decorated with graffiti love notes.

Once America’s most beautiful army base, this abandoned military fort on the coast of Monterey Bay has been left to the elements.

Successful artist residence program has filled this ranch with dozens of sculptures over the years.

This unique formation appears as though an asteroid landed on the forest.

The stones that traveled from Spain to eventually become a holy place for San Francisco's nature worshippers.

Carnivorous plants, medieval aphrodisiacs, and the largest original wood structure glass conservatory in the western hemisphere.

A favorite haunt of dinosaur loving children and hallucinogen loving hippies alike.

An overlooked and unassuming engineering marvel.

The only theatre in the world constructed specifically for sound movement.

This print shop boasts one of the largest pinball arcades in San Francisco.