A collection of huge Pre-Colombian structures in Alabama.

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.

The largest Art Nouveau complex in the world is a Barcelona hospital with a 600-year-long history.

Week-long block party becomes a competition for the best decorated street.

An ancient Egyptian temple in the middle of Madrid, Spain.

Mountain where Jesus was first tempted by the Devil.

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

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

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

This ritzy Italian market is built around a statue of an unforgiven heretic who was burned for his belief in an endless universe.

Secret refuge and museum of the Duke of Florence.

The famous sculptor left his mark on this Italian wall in an internationally protected example of street art.

Those who own or stay at this 500-year-old, allegedly cursed house often meet terrible fates.

The only visible reminders of an elaborate engineering project that kept the tower from reaching the tipping point.

The spot where the fascist dictator made some of his most famous speeches including declaring war on Britain and France.

A whale rib was used to advertise the store by the arch that offered exotic goods from far away.

Over 100 towers were built in Bologna during the Middle Ages, but only 22 survive.

The incorrupt tongue of the patron saint of lost things is venerated in this basilica.

A modern sliver of architecture in Roma.

Milan's duomo is covered in beautiful carving including a curious "dinosaur-like" beast.

A new sculpture calls attention to climate change in the centuries-old city it threatens.

Something's missing between the arcades of the Palazzo della Ragione in "the city of the three withouts."

Memorials at a Florence railway station remember the citizens who were deported from Italy and sent to extermination camps.

The roof of this ancient mausoleum is made from a single Istrian stone weighing a massive 230 tons.