Sparkling, calcite-covered skeletons of children who may have been sacrificed to appease an angry god.

The last occupied troglodyte dwellings in England weren't abandoned until the 1960s.

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

Ancient ruins hidden underneath a modern luxury hotel.

The martyr's wax-enhanced skeletal remains lie preserved in a glass case in the Santa Maria della Vittoria in Rome.

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

A monumental fountain in Rome features a large statue of Moses that has been criticized for centuries.

A domino effect created with Britain’s iconic telephone boxes.

This Iron Age hill fort remained hidden until a series of storms revealed its history.

This large, circular tomb is the final resting place of the first emperor of Rome.

The skeleton of a whale that beached itself in this Irish town is now on display in their public park.

One of the most popular megalithic sites in Ireland stands as a humbler version of Stonehenge.

This floating garden in the sky is straight out of a fairy tale, but the real thing is nothing short of magical.

The land is full of geologic eye candy, such as otherworldly spires, mushroom-shaped hoodoos, and prehistoric fossils.

The bizarre visions of H.R. Giger, tucked away in a Swiss medieval city.

The ritual has been performed uninterrupted for nearly 700 years.

These wire animal sculptures commemorate the exotic inhabitants that once called the Tower of London home.

There's an exclusive Beefeaters pub hidden in the Tower of London.

The watery entrance for condemned prisoners heading to the Tower of London is still visible along the Thames.

Six ravens are kept captive (but well-fed) at the Tower of London to prevent the fall of the Crown.

Graffiti from the 16th and 17th centuries cover the walls of this part of the Tower of London.

Tucked away in the Tower of London is the weapon once used to execute high-profile prisoners.

At Monet's beloved home you can still see the Japanese bridge, waterlilies, and weeping willows that were the subjects of some of his most iconic paintings.

This astonishingly geometric cave has inspired everyone from Jules Verne to Pink Floyd.