See 150 million-year-old dinosaur tracks and bones dating back to the Jurassic period.

An overlooked tribute to one of the most important peace deals in American history.

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.

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

On the wall of this medieval walkway, a symbol of the Spanish Inquisition.

One of Antoni Gaudí’s earliest buildings, built between 1886 and 1890 for the industrialist Eusebi Güell.

Turntable anonymously received orphans, alms, and groceries.

An excursion train traverses a picturesque red-rock canyon along the Verde River.

The largest and most well-preserved petroglyph site in the Verde Valley.

An urban laboratory.

A local student's chance encounter with Keith Haring led to the creation of one of Europe's largest murals.

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

Installed in an act of one-upsmanship, the annual sundial in this church is also a symbolic victory for the Gregorian calendar.

A monumental fountain in Rome features a large statue of Moses that has been criticized for centuries.

A forgotten "city of water" underneath the famous Trevi district.