Geothermal waterfalls in Tuscany.

The middle finger of modernity.

A master of trompe-l'oeil creates a stunning, tourist-fooling dome out of a flat ceiling.

This Venice bookstore has resigned itself to constant flooding by keeping its books in bathtubs and boats.

The only visible reminders of an elaborate engineering project that kept the tower from reaching the tipping point.

On rare days, this abandoned castle's gatekeepers open its doors, revealing the eye-popping splendor hidden inside.

Breathtaking and huge 430 year old maps of Italy.

The "Greatest Sewer" of ancient Rome is one of the oldest sewer systems in the world, and is still in use.

The yawning maw of this pagan visage is said to bite off the hands of liars.

Installed in an act of one-upsmanship, the annual sundial in this church is also a symbolic victory for the Gregorian calendar.

2300-year-old Roman road connecting the empire.

An alchemist's "magic door" stands in the middle of a Roman park.

An acoustic anomaly with a mysterious cause.

A statue high in a hill that represents how Buffalo Bill got his name.

The second largest waterfall by volume in the U.S., Willamette Falls is outdone only by Niagara in the amount of water that is pushed northward.

Mountain known by the Tillamook Tribe as "the place of the supreme deity."

The longest continuous lava tube in the continental U.S. offers 2.5 miles of dark explorations for the adventurous.

This historic building provides a powerful glimpse into the lives of Japanese Americans forced to relocate during World War II.

This semi-secret garden in south Seattle emulates a traditional Japanese garden using the plants of the Pacific Northwest.

A huge musical sculpture and other art installations on the National Oceanic and Atmospheric Administration grounds.

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.

A fine, large-aperture telescope available for public use.

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