Since the 1700s, this old barrel has acted as a post box that relies on the kindness of travelers.

Building this tragically pointless stone barrier cost the lives of the prisoners made to build it.

An elaborate shrine dedicated to the four corners of the world unfortunately misses its mark.

A sanctuary for sickly, stray, or wounded donkeys.

Shipwrecks, ruins, and turtles are all that remain on this haunting Caribbean ghost island.

The mouldering manses of wealthy colonials still pock the streets of a Curaçao neighborhood.

This tiny tropical village was sick of anonymity so the locals made this sign, which actually changed the name of the town.

A safe place for the wild donkeys of a hot vacation destination.

In 1927, a biplane disappeared while attempting to complete the first non-stop transatlantic flight between Paris and New York City. This memorial stands at the last place it was seen.

One of the oldest and largest wooden churches in France was very evidently constructed by shipbuilders.

This Luxembourg cave is covered in cryptic looking marks left by mining activity.

This tri-part waterfall is a little bit of fairytale beauty in the heart of Luxembourg's Little Switzerland.

This noble mash-up in eastern Luxembourg is part Medieval, part Renaissance, all castle.

A geothermal paradise with bubbling mud pools and bright blue hot springs.

The tallest mountain in mainland Netherlands isn't actually very tall.

Abandoned since 1998, this train station has become an oasis for urban explorers.

The highest point in Belgium is a staircase to nowhere.

A whimsical bridge uses saxophones to pay tribute to two great men and the European Union.

Climb inside an iron crystal magnified 165 billion times its normal size.

One of the deepest indoor swimming pools in the world.

Each spring, a dreamlike carpet of bluebells overtakes the forest floor.

A magical and peaceful ruined Cistercian abbey in what is now southern Belgium.

Enormous crabs, bioluminescent jellies, and other amazing creatures from the ocean’s depths—some of which are in an aquarium for the first time ever.

Over the course of its history, this tiny island has held enslaved people in transit and served as a quarantine zone. Today, it's a giant tortoise sanctuary.