An explosion of natural color known as "the river that ran away from paradise."

A little known Colombian theme park of giant curiosities.

What's believed to be the country's first shrine is, in Shintō mythology, the annual meeting place of the gods.

Iran's colorful terraces are a rare geological masterpiece.

This ancient monastery complex was transformed from an island to a peninsula when the lake was partially drained.

The United Kingdom's smallest working cathedral also serves as a quaint bed and breakfast.

This skeletal, unfinished Gothic church once housed a miraculous masterpiece by Raphael.

On a cornerstone of the City Museum is the head of a monstrous serpent stolen from an Aztec pyramid 400 years ago.

This castle ruin in the middle of nowhere is a gem for wildlife enthusiasts.

Parts of this sprawling temple complex are deteriorating, but its founder’s body remains intact.

This macabre monument atop an ancient well gives a nod to a brutal episode in Scottish clan history.

In the heart of Medellín, an artsy urban complex sets the stage for demonstrations and protests.

These carved medieval "mercy seats" are among the finest in the world.

The railway carts travelers to central Athens's highest peak, which offers stunning vistas of the city.

An outstanding piece of retro Sci-Fi architecture built into a sacred mountain.

This fantastic cave remained unexplored until 1948 when three schoolboys discovered a hidden entrance.

A fantastical 13th-century fortification sandwiched by a modern hotel in central Brussels.

This ruin in a suburban park may be the place where Shakespeare's "A Midsummer Night's Dream" was first performed.

This tiny traditional smokehouse is the only one left in this historic fishing port.

In Faroese legend, this sinister horse-shaped beast lures unsuspecting passersby only to drown them in the lake.

This beautiful fountain was sculpted by a female artist who was ahead of her time.

This 15th-century cave complex is one of the very few monasteries to stay open throughout World War II and the Soviet regime.

History, geography, and shamanism meet in this eye-catching monument to the greatness of three empires.

This historic little railroad runs through some of the most beautiful scenery in Germany.