The conquistador's former fortress is the oldest preserved colonial building in the Americas.

A 16th-century monastery boasts a lush array of plants native to Mexico’s most biodiverse region.

This graveyard boasts a medley of diverse and imaginative funeral architecture.

The iconic boulevard is the perfect place to catch sight of a bicycling skeleton, a levitating Satan, or a chef with his head stuck in a pizza.

This cemetery features modernist statues as strange as its name.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

These slanted cubic abodes are a creative if odd solution to a zoning pickle.

Birthplace of the "Cat in the Cradle" and a cluster of iconic, original windmills that let the Dutch tame the seas.

Devious political maneuvering and four ancient, working telescopes are central to the world's second-oldest observatory.

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

A 'living museum' in Leiden, the oldest of its kind in the Netherlands.

Colorful and chaotic stacked hotel in North Holland.

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

A hidden church in a hidden courtyard tells the story of the Miracle of Amsterdam.

The attic of a four-century-old canal house hides a clandestine church.

This city square is home to Amsterdam's oldest church and a statue honoring Dutch sex workers.

A public urinal so pretty, it was declared a national monument.

Amsterdam's former hotspot for public executions and dissections.

Established in 1638 to battle the Black Death, Hortus Botanicus Amsterdam is a treasure trove of rare flora.

A section of the long chain that blocked enemy ships from entering Constantinople.

Five sultans and their families rest in eternal splendor, teeming with overlooked beauty and drama.

Legend says if you stick your thumb in the hole and it gets wet your wish will be granted.

A marvel of Byzantine engineering under the streets of Istanbul.