An underground city of salt.

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

This one-time health resort was used by aristocrats around the world.

Museum deep in the catacombs of St. Michael the Archangel Church is explored by touch, sound, and smell.

A black cat protests the City Guild in Riga's Old Town.

Rotterdammers' dirty minds gave this Santa a dirty nickname and cursed it to a life of wandering.

These slanted cubic abodes are a creative if odd solution to a zoning pickle.

A whimsical and twisted animatronic monster tour beneath the streets of Berlin.

A series of waterfalls so massive they straddle the border of Argentina and Brazil.

One family's mission to exemplify sustainability took on a whole new life as a surprisingly beautiful home.

A 125-meter long "tribute to the Brazilian people."

Two giant painted cooling towers make for one of the world’s most epic bungee jumps.

A sobering account of the vibrant multicultural neighborhood that was destroyed under apartheid.

Formerly known as the Malay Quarter, Bo Kaap is a colorfully-painted suburb located in the “Mother City” of South Africa.

This African beach is home to thousands of rare mainland penguins that are known for their annoying voice.

This "dead marsh" sits among the largest sand dunes in the world, a forest frozen in time.

A desert that rolls right up to the ocean, where it's so dry animals live off the fog.

The remains of diamond fever taken over by the desert.

This rusting remnant of the local herring industry is being given a second life.

The oldest steel ship in Iceland has been beached for years and is now a rusting ruin.

This wrecked airplane has been sitting on a black sand beach since the 1970s.

If a glacial river suddenly diving into a sheer chasm via a dramatic, multi-stage waterfall isn't peak Iceland, it's certainly close.

This valley of hot springs and boiling mud pots is home to the record-holding "Geysir," which originated the English word.

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