Hidden behind Lincoln's head is a chamber containing enamel plates documenting American history, sealed in a teakwood box in a titanium vault.

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.

Where Saint-Martin ends and Sint Maarten begins (or vice versa).

A bridge that has seen many reiterations over its lifetime.

The largest 19th century panorama in the world still in-situ.

Yup, that's a 330-foot yacht passing over the highway.

A historic observatory now an astronomy museum beautifully situated at the moat of the Middle Age city centre.

An oasis of shade and color amidst the bustle of the old city.

Walk through a clothing store, across a courtyard, and up several flights of stairs for delicious coffee with a side of beautiful views.

This tiny lake temple dedicated to a water goddess seems to float on the surface.

This fountain of a little boy that spits on passersby at erratic intervals is a town icon.

Two standing giants remain as a tribute to Luxembourg's metallurgical past.

Inside a Scottish castle hangs the tattered remains of a flag with murky origins and supposed magic powers.

This collection of Neolithic monuments make up one of The U.K.'s richest archeological landscapes.

Largest lake in Great Britain measured by surface area.

One of the most powerful religious centers in the Middle Ages, dubbed the founder of Western monasticism.

A massive 1830s industrial site once known as Czechia's "Iron Heart" has been transformed into a playground of science, technology, and art.

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

Museum celebrating the ocean, with the largest wunderkammer dedicated to sea exploration.

These upturned herring boats make nifty storage sheds for fishing goods.

Considered "the most original, complete, and unimproved" circles in Aberdeenshire.

Cut into a sheer cliff face, these stairs are the only way to reach a secluded Scottish harbor.

This short white tower is all that's left of Scotland's first permanently manned lighthouse.

Now in ruins, this castle stood for centuries and saw a number of gruesome events.