Once the site of the Hawaiian monarchy, this building was originally designed as a palace.

This strange hill on Old Fort Road where gravity works in reverse has been fascinating locals for years.

The site of a 19th century "dream city" that almost rivaled Chicago before being swallowed by the Indiana sand dunes.

Indiana's oldest sternwheel paddleboat has been plying the placid waters of Webster Lake for 90 years.

One of the world’s largest living advertisements is made out of pine trees.

Possibly the oldest church in Barcelona, this basilica has its pagan and Christian mythologies all mixed up.

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.

A gravity-defying "devil's bridge" that has a surprising architectural feature for its stability.

Barcelona's historic 19th-century sewers, whose foundations were laid in medieval times, are open to the public for exploring.

The abandoned ruins of a beautiful medieval castle just outside Barcelona.

The largest natural travertine bridge in the world is nestled in a small canyon in central Arizona.

The historic “pink house on the hill” is an architectural gem that now serves as a center for water conservation.