The world's oldest bookshop still in operation.

Ancient paintings known as the "Sistine Chapel of Cave Art."

A fitting attraction for the corn capital of the world.

The highest point in Washington state is a volcano covered in glaciers.

The granddaddy of all tourist traps, built on ice water, jackalopes, and a giant dinosaur.

Sail through this subterranean show cave that is home to a legend that would go on to name nearly everything around it.

This fairy-tale, neo-Gothic church in the Azores is a world of magical realism.

Mortarless walls that stretch for miles are a lovely solution for creating grazing land in the harsh terrain of the Aran Islands.

The bright red stripes streaking across the rocks are the star feature at this Icelandic waterfall.

Puffin enthusiasts flock to Europe's largest seabird cliff, which over one million birds call home.

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

Medicinal spa created from the mineral-rich runoff of a geothermal power plant

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

This abandoned five-star hotel is now a five-star urban exploration destination.