A sculpture made of 10 Cadillacs as a monument to the “Golden Age” of the American automobile.

An enormous pink granite batholith, long attributed with spiritual powers by the Tonkawa Indians.

Over 100 million years ago, beach-bound dinosaurs left permanent marks on San Antonio's landscape.

These boots are made for selfies.

A 131-year-old wunderkammer of Texas history.

Legend has it the commander of the defenders drew a fateful line in the dirt with his sword just before the final battle.

Alabama has a fiberglass Stonehenge. With apologies to Spinal Tap, this one is full-size.

Florida’s half-sized replica of the Vietnam Veterans Wall.

A local landmark with generations of spraypainted messages, and more being added each day.

This now-deactivated naval base defended the Florida coast for centuries.

One of the only Florida forts to remain in the hands of the Union all through the Civil War still stands as a historic stronghold.

Pensacola's UFO home has withstood many hurricanes—just as the experimental 1960s design intended.

Amsterdam's Red Light District leaves little to the imagination.

2300-year-old Roman road connecting the empire.

Breathtaking and huge 430 year old maps of Italy.

Historic fortifications form the boundary of Vatican City, but it’s not entirely surrounded by walls.

Hidden beneath the famous St. Peter's Basilica is a veritable city of the dead that may hold the remains of St. Peter himself.

This noble mash-up in eastern Luxembourg is part Medieval, part Renaissance, all castle.

A little sculpture with a large wardrobe.

The prototype for all Nazi concentration camps.

One part local history, 99 parts gruesome haunted house.

Iceland's tribute to its thankless civil servants.

An encyclopedic collection of mammal penises.

One of the tallest buildings in Iceland, and perhaps, the most visually impressive.