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

The most iconic structure in Scotland has been home to bishops, colonels, and Sean Connery characters.

Overlooked by many, the two famous Scottish warriors guard the main gate of Edinburgh Castle.

This giant wooden treehouse within a sprawling garden has its own eatery.

The sign at the garden gate reads: “These Plants Can Kill.”

A steep and winding road in the Yorkshire Dales passes by these deep natural potholes.

Classic game cookery takes center stage at what's widely considered London's oldest restaurant.

The oldest inn in England served brew to the crusaders.

The names Lúthien and Beren can be found inscribed on the shared grave of the famous writer and his beloved wife and muse.

Eighty million natural history specimens call this gargantuan museum home.

Instead of fruit, the branches of this tree are brimming with hopes and dreams.

The world's last remaining store of its kind.

Only known mainland rookery of the threatened Stellar sea lion.

On the Oregon coast is a natural hole that seems to be draining the sea.

No one knows how this Pacific Northwest spruce tree came to have so many trunks.

The eerie remnants of an ancient forest were hidden under the sand for centuries.

A massive sea stack famous for its appearance in The Goonies.

An extraordinary mixture of natural beauty and man-made phenomena.

A roaring, awe-inspiring double cascade of icy water flows through woodland Oregon like something out of a Tolkien novel.

This extravagant Art Nouveau rest stop features a million-dollar view of the Columbia River.

Tiny horses tethered to antique rings are scattered around the city.

An obsolete, vanishing traffic device warns Cincinnati drivers away from middle-of-the-road obstructions.

This bug-eyed water wheel uses the power of the Sun to clean up Baltimore Harbor.

Some of New York's best tacos can be found in the back of an unassuming bodega in Queens.