This massive library holds what was once the largest book collection in the world.

In the days before house numbers, these colorful signs held clues about various buildings' purposes.

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

An ancient passage filled with stalls selling used books, once frequented by Vincent Van Gogh.

An Amsterdam street lined with antique shops each one dedicated to a different obscure collection.

Accessible only by boat, this centuries-old island fort never saw troops or combat.

A futuristic climate change study is nestled deep within this public land.

The biblical sculpture honors those who lost their lives, homes and communities to the Chernobyl disaster.

One-of-a-kind preserved ruins of an abandoned 1880s church in Chicago's Pilsen neighborhood.

A palatial former bank building now houses what may be the poshest art venue (and former Tesco) in Belfast.

This Victorian-era public house has set the standard for pub-style elegance for over a hundred years.

The bust of Romania’s most notorious ruler, Vlad Dracula aka "Vlad the Impaler," keeps watch over the ruins of his medieval court.

A hidden three-foot-wide house separates these two regal churches.

Swedish mice can dine at the Nuts of Life restaurant or take a date to the amousement park.

This wondrous waterfall rushing down a green-covered mountain wasn't discovered until 2010.

The forbidden island of the Tuscan Archipelago may still contain buried treasure.

In La Paz's huge, city-sized cemetery, the deceased are stored in rows of apartment-like buildings.

Where the Great Wall of China meets the sea.

Once the home of a hermetic monk, this cave now houses a small church.

A series of caves under Castle Hill that once held the prisoner Vlad Tepes, better known as Count Dracula.

Built in 1870 at the bridge that connected Buda and Pest, this spectacular incline railway was almost lost forever during World War II.

A Jenga-style cylindrical tower of books that appears to go on forever.

Twisted girders are all that remain of an Icelandic bridge that was wiped out by a combination of volcanic heat and glacial floods.

The unique waterfall in Iceland's south features a backdrop of geometric black lava columns.