Iceland's "Smoky Valley" is a beautiful river that is shrouded in a constant cover of steam clouds.

A 16th century chapel decorated with bones, skulls, and entire bodies hanging from the wall.

The largest greenhouse in the world is home to over one million types of plants.

Strange rock formations tower above the river that snakes through this enchanting Icelandic canyon.

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

The ruins of this gorgeous clifftop castle look like something from a fantasy novel.

With over 12,000 different species of plants, this botanical garden is Japan's oldest and most diverse.

People have been living in the cave houses on this Italian hillside since the Neolithic era.

The field of tiny caves that mark this Chinese cliffside are each their own historic Buddhist temple.

This community on a small Venetian island has taken to painting their houses in bright neon hues.

Hidden in a secluded Greek cove is a pristine beach marred only by the rusting smuggler's hulk stranded on its shores.

The gorgeous entrances into the city's underbelly look more like grand halls than subway stops.

Hidden deep in the Guatemalan jungle is a turquoise paradise of natural pools, caves, and waterfalls.

Walk in the footsteps of the gods and straddle two tectonic plates.

These fantastically named natural pools look like something out of a Scottish myth.

This iconic 1,000-year-old medieval castle is a favorite of the film industry, most notably as the location for Hogwarts in Harry Potter.

Outlaws, hot springs, and tragedy have all left their mark on this ancient road in the Icelandic highlands.

This mosaic-lined medieval church was built by the world's first admiral and still holds mass in ancient Greek.

The oldest church in Iceland is one of the few to feature ornate decoration.

A program of Communist glamour in post-Stalin Poland is preserved in this colorful museum.

Plundered and left asunder by grave robbers, this ancient necropolis has been painstakingly pieced back together.

A set of ancient drawings in the desert of Peru that are so massive, many of them can only be fully seen from the sky.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

Ruined 11th century abbey built by King David I in Edinburgh, Scotland.