One of Amsterdam's narrowest houses is located right across the canal from its widest.

At just 51 feet and 10 inches long, it's the shortest street in England.

The ornate miniature mansions were built for Istanbul's feathered residents.

Roman ruins top white travertine terraces formed by ancient hot springs.

In this historic region, homes and churches are carved into ancient volcanic rock formations.

Explore this medieval cathedral by trying to spot all the malevolent monsters hiding in its beautifully colored windows.

A fifth-century temple improbably built into the side of a cliff.

High Victorian fantasy created a fairytale castle out of a ruined fortress in Wales.

This demon atop the Notre-Dame de Paris looks utterly bored.

The tradition of open-air secondhand and antiquarian bookselling in Paris dates back to the Renaissance.

Indents in the pavement are all that remain from a grisly death machine in Paris.

A harem-inspired Moorish fantasy design in a Victorian-era Welsh castle.

England's steepest street has such a drastic incline that locals tie their parked cars to lampposts when it gets icy.

A winery built on the site of a Gallo-Roman estate uses historical tools to recreate ancient vintages.

This ancient theater was once the home of fierce gladiatorial battles.

The Cimetière des Chiens et Autres Animaux Domestiques is one of the oldest pet cemeteries in the world.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

The water-powered carriages are long gone, but for over a century this funicular railway has been the fastest route to the highest point in Paris.

"In the Dark" Restaurant in Paris offers dinner in complete darkness.

Hidden behind musical flora and forgotten for over a thousand years, this cave is now a neon dream.

The most famous location in China was home to whole dynasties worth of imperial rulers.

A plaque claims this artwork outside a children's hospital was used in the 1998 Quidditch World Cup.

Banksy's image of a naked man dangling from the window of a sex health clinic.

The granddaddy of English geoglyphs dates back to the late Bronze Age.