A school teacher's massive and terrifying self-built castle.

This oceanside Reykjavik spot is speckled with recycled sculptures and large stones.

This tiny museum's sizable collection is jammed into a former underground public toilet.

An encyclopedic collection of mammal penises.

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

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

Tucked in the back of a flower shop, its collection details the fascinating history of the Netherlands's iconic symbol.

This gorgeous reading room houses the oldest and largest art history library in the Netherlands.

The world's first zoo for microbes collecting the horrible and wonderful things living on and around us.

Three connected pink triangles memorialize persecuted gays and lesbians throughout history.

This bird-loving brewery is situated in an old municipal bathhouse, nestled beside a 300-year-old windmill.

This giant roadside fruit is home to an array of apple-based treats.

An abandoned 1970s theme park that has been turned into a space for waterfront walking.

A 1975 bylaw prohibits the construction of any building that would block the view of this Gothic Revival church.

With well over 130 falls and cascades to brag about, Hamilton, Ontario has earned its stripes as the waterfall capital of the world.

This natural sea cave hides a small wonderland of natural turquoise beauty.

The most famous location in China was home to whole dynasties worth of imperial rulers.

A wacky two-story folk-art assemblage of carved and found objects, with lights, motion, and sound now in need of financial support.

This sprawling bookstore spans four floors and has more than a million books in stock.

Sweden's oldest animated sign is still lighting up the skyline today.

Stockholm's narrowest alley is barely over two feet wide.

An ancient Viking runestone hidden in plain view in Stockholm's old town.

Stockholm's deepest subway station is also a stunning ecological wonder.

Now a hotel, this former bank was the site of a robbery that spawned a psychological phenomenon.