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

The ruins of this gorgeous clifftop castle look like something from a fantasy novel.

A baffling beast so absurd a town councilman called it "intellectual vomit in technicolor."

The fountain marks the area where hundreds of accused witches were burned at the stake.

Northern Ireland's Brobdingnagian stepping stones.

A beautifully eclectic mix of architectural styles.

The world's only museum devoted to the wonders of fluorescence.

Seven mini rowhouses fill the gap between 54 and 70 Westerstraat.

A floating cat sanctuary on an Amsterdam canal.

The history and future of cannabis.

Lombardy poplars planted to imitate the size and shape of the Cathedral of Notre-Dame de Reims.

Cat art as far as the eye can see.

A rare tour of an aristocrat's private home reveals valuable 17th-century paintings from artists like Rembrandt.

This unusual elevator doesn’t stop or slow down.

In the days before house numbers, these colorful signs held clues about various buildings' purposes.

This historic Amsterdam bar used to accept sailor's monkeys as payment.

Amsterdam's former hotspot for public executions and dissections.

An Amsterdam street lined with antique shops each one dedicated to a different obscure collection.

This unattributed sculpture in Amsterdam is hiding in plain sight.

This macabre monument atop an ancient well gives a nod to a brutal episode in Scottish clan history.

Built to hold the worst of the worst of the Nazi war prisoners.

This unusual rock looks like a giant, otherworldly mushroom sprouting atop a cave.

This tiny island is home to the world's largest colony of Northern gannets.

A cross marks the spot in a small Scottish village that claims to be the exact center of the country.