A sulfuric martian landscape that looks far better than it smells.

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

The largest whale museum in Europe allows visitors to walk among life-size giants.

The oldest (maybe) swimming pool in Iceland is a stunning oasis built into the side of a lush hill.

Three columns of volcanic rock shoot out of the ocean.

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.

The most powerful waterfall in all of Europe.

This elegant arc of a waterfall marks a religious turning point.

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

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

An encyclopedic collection of mammal penises.

Iceland's largest lagoon is home to stunning multi-colored icebergs.

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

This fantastical waterfall is hidden in a cave located in a cracked cliff.

The 20-mile causeway that separates the Netherlands from the sea.

The seawater playground of gilded-era San Francisco burned to the ground in 1966.

The iconic boulevard is the perfect place to catch sight of a bicycling skeleton, a levitating Satan, or a chef with his head stuck in a pizza.

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

Historic medieval fortified city in southwest France.

The world's largest solar furnace uses 10,000 mirrors to concentrate the sun's rays to generate power.

The National Railway Museum in York is the largest railway museum in the world, attracting almost 1 million visitors per year.

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.

A modern English garden of eccentric beasts, follies, and oddities.