One couple’s bespoke castle is one of Pittsburgh's most fashionable dining spots. 

One of the oldest surviving lock houses on the Ohio River.

This piece of early engineering is rather unknown despite its location in the heart of Madrid.

A stone slab in Madrid marks the point from which the distances of Spain's national roads are measured.

A home for Spain's version of the Tooth Fairy, hidden in an old gas company register.

Madrid's romantically ornate crystal palace has been offering shelter to plants and art for over a century.

Commonly acknowledged as the only public monument to the Devil himself.

One of Madrid's oldest trees, with a long and colorful history, resides in El Retiro Park.

A statue commemorating a beloved stray dog who was adopted by the entire neighborhood where he lived.

Built to power trains, the engines in this building provided the entire city of Madrid with electricity during the Spanish Civil War.

Spanish architects used seized Muslim gravestones to rebuild parts of the fortress.

A museum dedicated to the centuries-old cave dwellings that housed marginalized communities on the outskirts of the former capital of Muslim Spain.