Witnessing the might of this dessert-colored desert waterfall is a rare, powerful treat.

The world's largest frame offers spectacular views of the city's past and present.

A volcanic tunnel illuminated by natural skylights offers a shaded respite from the desert sun.

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

Elaborately carved to showcase the glorious wealth that the age of exploration brought to the Portuguese empire.

Brightly colored 30-foot-tall totems light up the desert sky just outside Las Vegas.

This Industrial Age architectural and engineering gem helps visitors and residents alike traverse Lisbon, “The City of Seven Hills.”

Concrete crosses scattered across the Arizona scrubland which were used to align spy satellites.

A promotional sun clock on the site of San Francisco's great raceway.

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

An abandoned facility that has become a place of ritualistic satanic worship, or so rumor has it.