An underground paleo-Christian burial site composed of the remains of several cemeteries and Basilicas.

This medieval city gate is now a blend of the past and the modern world.

This museum housed in a former brothel explores the past and present of sex work in Amsterdam.

One of Amsterdam's narrowest houses is located right across the canal from its widest.

These medieval skyscrapers dominate the skyline of this small Tuscan town.

Renaissance villa and gardens complete with a tormented colossus.

This private skyway is filled with art and was expanded explicitly so that Hitler could appreciate a river.

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

This bronze boar's snout has been rubbed to a golden sheen by visitors seeking good fortune.

The lowest point in North America is home to an undrinkable pool surrounded by fields of geometric salt flats.

A Norwegian-born sculptor created these soaring guardian angels at the entrance to Hoover Dam.

A professional special effects makeup artist’s collection of horror creatures and one-of-a-kind recreations on display in downtown Boulder City.

This playground sculpture of an icon from the past is dedicated to the children of the future.

This inanimate goat created by the "welding nun" has been helping to clean up the city of Spokane for more than 40 years.

The mayor made the declaration in 2004.

After this former brothel closed, its interior remained almost frozen in time.

Residents of Fremont in Seattle have considered it the center of the universe since the 1970s.

A 100-year-old purveyor of curiosities, curios, and kitsch featuring mummies, shrunken heads, and a Fiji Mermaid.

The first KFC is on the National Register of Historic Places.

The farm where one of America's greatest leaders was raised is now a well-appointed landmark.

This spectacular public market has got meat, fish, vegetables, baked goods, and enough kielbasa for a lifetime.

This former tuberculosis treatment facility now stands at the center of a public park.

Learn about the history and craftsmanship of carousels inside this museum located in a former post office.

Visit a replica of the estate where Aaron Burr allegedly plotted a treasonous scheme against the United States.