A castle built for love, and abandoned due to heartbreak.

This observation tower is a longstanding, 1960s landmark in the Thousand Islands region of Canada.

The world's first ice hotel is still one of the most elaborate and beautiful.

Explore the frozen river and take a walk to a nearby island on some of the longest ice roads in Sweden.

The first overseas server for Facebook in Sweden's tundra.

The cheese slicer may be a Norwegian invention, but the biggest ones in the world are found in Sweden.

This disputed feline sculpture is Sweden's first MeToo monument.

Contrasting the old concrete courthouse beneath, a modern and colorful residential marvel has emerged, stirring both acclaim and controversy.

Former headquarters of the KGB.

A 250-year-old timepiece-automaton adorned with golden mechanical birds, which still sing to this day.

Finland's oldest astronomical observatory once played a crucial role in seafaring and timekeeping.

A subterranean house of worship carved right out of the bedrock.

Small Easter eggs are hidden in the ventilation holes of the city's newest trains.

This statue once earned the distinction as one of the "Three Major Disappointments of the World."

This historic spot was where America's involvement in the Vietnam War officially came to an end.

A nightmare for the claustrophobic lies hidden in Southeast Asia.

This naval gun is fired every day at noon, an odd timekeeping tradition the origin of which is local legend.

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

The world’s largest work of glass art hides in this stunning Taiwanese subway station.

An extraordinary natural landscape of mountains, waterfalls, and rocky cliffs riddled with tunnels.

Enormous pendulum helps keep Taiwan's tallest building from swaying.

Memorial to the father of the Republic of China.

Air-raid tunnels hidden beneath this opulent hotel provided shelter and an escape route—and one of the world's longest slides.

Once a prosperous mining village, this tiny Taiwanese town is now overrun with cute cats.