Descend 2,030 years into the past in an ancient tunnel built to support Jerusalem's most famous wall.

This daunting 1st century fortress was purportedly the site of one of the most dramatic revolts of the Jewish-Roman wars.

The home of the Dead Sea Scrolls is an abstract modernist dream.

This enormous censer uses a pulley system installed over 400 years ago.

Stormy conditions send jets of seawater bursting through holes in the cliffs.

Natural stone arches form a walkable "cathedral" at low tide, then disappear entirely when the water returns.

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

Try your hand at old-fashioned coffee growing at this museum devoted to one of the world's most coveted beans.

This black shoreline is made up of exploded lava particles.

A multi-storied adobe complex has been inhabited for more than a thousand years.

The fifth-longest natural arch in the world, and the longest outside China.

This huge dam across the Colorado River caused an armed standoff between two U.S. states.

The hallowed remains of a 900-year old Ancestral Pueblo great house.

The marker offers a rare chance to be in four U.S. states at once, though there's some controversy over its geographic accuracy.

This isolated outpost was once the only place to cross the Colorado River for hundreds of miles.

A sharp bend in a dramatic river canyon cut through red rocks.

Legends surround this jagged rock formation in the New Mexico desert.

A phenomenal assembly of pueblos in New Mexico is the most complete example of ancient ruins north of the border.

One of the most extensive and well-preserved collections of dinosaur footprints in North America.

Red sandstone structures dominate this landscape, which has been inhabited for some 5,000 years.

The cinder cone volcano with a less than complimentary name.

This historic national park is covered in the stunning ruins of red rock pueblos.

The highest point in Arizona is an oddly snow-topped peak within the otherwise arid state.

The wreckage of a deadly bomber plane crash can still be found near an Arizona peak.