These numerous Israeli caves were dug out over hundreds years for reasons ranging from hideouts to burial sites.

The bluer than blue waters in these natural Israeli caves are reached via the world's steepest cable car.

This sixth-century synagogue was first reconstructed digitally, then in real life.

Named for the biblical warrior, the largest castle in Israel actually dates to the Middle Ages.

With its webbed walls and bright red coloring, Calgary's iconic bridge looks like a finger trap puzzle stretched across the river.

This massive mall has hundreds of shops, an amusement park, and a history of deadly amusement attractions.

Many people don't realize there’s a lot going on in—and below—the world’s tallest triumphal arch.

The only castle in North America to ever house European sovereigns.

These haunting ruins of a 700-year-old Prehispanic city have witnessed centuries of wars and massacres.

Underneath the historic center of Mexico City, the remains of a temple dedicated to the Aztec god of the wind.

A safe place for the wild donkeys of a hot vacation destination.

The mouldering manses of wealthy colonials still pock the streets of a Curaçao neighborhood.

The floor of the oldest surviving synagogue in the Americas is entirely covered in sand.

This enigmatic building features numerous architectural styles.

A small horde of mythical creatures lurk almost imperceptibly within the museum's wildlife dioramas.

The Denver airport is guarded by a 32-foot-tall sculpture of a demonic horse.

Strange red rock formations that have been attributed to a higher power for hundreds of years.

This super steep hike ascends 2,000 feet in less than a mile.

There are eight natural springs around town, each with a slightly different taste.

While most of the games in this arcade take quarters, that would have been a small fortune when they were made.

These faux-cliff dwellings allow visitors to climb around on a replica archaeological site.