A volcanic old faithful, Stromboli has been erupting continuously for the last 2000 years.

The ruins of the largest gladiatorial school in Rome are largely hidden under modern streets.

Inside this McDonald's you can dine on your Big Mac and fries next to a 2,500-year-old Roman wall.

A celebrity from the late Cretaceous period.

Home to items never before seen by the public.

While most wind tunnels test scale models, the "Cave of Winds" was large enough for actual airplanes.

The winding route passes through an enclosed alleyway, two tunnels, and leads to the White House basement.

This old-fashioned carhop restaurant gave the world the waffle cone.

Metal dinosaurs lurk in a sculpture garden on the outskirts of a popular resort town.

Scenic mount trashmore, Virginia Beach's most curious waterfront still has a couple of secrets.

An excursion train traverses a picturesque red-rock canyon along the Verde River.

A surreal, Gaudi-inspired play space near an Anaheim community center.

One of the most extensive and well-preserved collections of dinosaur footprints in North America.

A self-built castle made by a mysterious man.

Thousands of Mexican Free-Tailed Bats soar around an abandoned storm drain at sunset each summer.

As can be expected from a centuries old church built in a canal city, the undercroft of this house of worship is beautifully flooded.

A "gravitational anomaly" located in the redwood forests just outside of Santa Cruz, California.

The world's most active stratovolcano is almost always erupting.

A larger-than-life house of cards stands outside the house of a former fashion designer.

Milan's duomo is covered in beautiful carving including a curious "dinosaur-like" beast.

The secret medieval communication system will whisk your words above the noise of the crowd.

The deepest underground city in Turkey was designed to protect 20,000 people behind massive stone doors.

Known as the Royal Palace of the Euganean Hills, this often overlooked castle has been home for multiple noble families over the centuries.

A complex, nine-layer maze on the grounds of a Venetian doge's playground.