This historic Melbourne bullet factory is fully encased in a massive glass and steel cone.

This historic island prison holds one of the dungeons from the Count of Monte Cristo even though it is a work of fiction.

The mouldering manses of wealthy colonials still pock the streets of a Curaçao neighborhood.

This historic covered bridge contains a series of macabre paintings that communicate one thing: everyone dies.

This controversial Irish show cave is home to a massive formation known as the Great Stalactite.

The field of tiny caves that mark this Chinese cliffside are each their own historic Buddhist temple.

These numerous Israeli caves were dug out over hundreds years for reasons ranging from hideouts to burial sites.

This historic Jewish cemetery sits right in the heart of a Detroit car factory.

This centuries-old gothic monster has been converted into a sprawling, glossy bookstore.

Not even a series of devastating fires could keep this odd castle in upstate New York from bouncing back.

This high-design church is made up of two dizzying spirals meant to evoke the weaving together of marriage.

These crumbling Nazi artillery bunkers are now fair game for massive graffiti projects.

This singular Irish dolmen is more Frank Lloyd Wright than upright stonehenge.

One of the largest amphitheaters in Europe is a former Nazi gathering place that still stands today.

This Sumatran root bridge took almost 30 years to knit itself together.

This tiered waterfall is so pretty it may cause visitors to cry tears of their own.

Oslo's historic toboggan run has been letting thrill seekers slide from train stop to train stop for over a century.

A tiny plaque hidden miles into the Washington wilderness is all that remains to honor a shipwreck that left 18 people dead.

This Hawaiian cattle ranch acts as a museum devoted to the island cowboys that predate the wild west.

The last of Philadelphia's wood-paved streets is now a landmark of terrible engineering.

It's not hard to see why the historic Peabody Conservatory of Music's library has been described as a "cathedral of books."

The ancient past meets the retro-future at these dinosaur tracks that are protected by a geodesic dome.

This Irish show cave is said to have been the site of a Viking massacre that claimed 1,000 lives.

Hidden within a Netherlands crater is a stone bed that lets those who lie in it see the sky as a curved surface.