This freshwater spring fills with 10,000 gallons of water per minute.

Hell on Earth is actually a small town in Michigan where anyone can be mayor for a day.

Turnip-shaped island just off the Michigan shore in Lake Huron.

This eye-popping Icelandic crater lake is surrounded by red volcanic rock.

Medicinal spa created with the discharge from a geothermal energy plant.

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

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

The library's graceful rotunda is like a bibliophile's temple.

A series of modernist treehouse hotel rooms grace the outskirts of an Arctic forest.

Stockholm's decidedly unique public transit system has doubled as the world's longest art gallery for decades.

At 929 pounds and 26 feet tall, this stainless steel fork can only be used by the likes of King Kong.

Swiss vineyards in a UNESCO heritage site.

Walk through a restaurant's refrigerator door to reach this hidden bar.

World's largest permanent maze made of 18,000 conifers.

Traversing steep Alpine slopes, this engineering marvel is one of the longest and highest funiculars in the world.

The alpine falls where Sherlock Holmes apparently met his demise can actually be visited.

A once-thriving hotel in the Swiss Alps couldn't compete with climate change.

This memorial commemorating fallen Swiss Guards of the French Revolution has been called the saddest stone in the world.

This is not only one of the oldest collections in Europe, but also possibly the most beautiful.

One of Vietnam's most iconic landmarks was built by Japanese traders and is now in danger of sinking.

A sculpture park that takes the use of clay to a whole new level.

This Vietnamese bar doubles as a multistory labyrinth.

A desert in southeast Asia, complete with a beautiful lake covered in lotus flowers.

Have fun at the world's first Buddhist waterslide park.