A science teacher's dream.

Former hotel turned into haunted playground.

A onetime gangsters' hideaway where you can dine on steaks, fine wines, and cigars just like they once did.

World's second largest particle accelerator, where nature reveals its secrets.

The site of one of the strangest disasters in history—a wave of deadly molasses traveling at 35 mph.

What was once a true peninsula has now been filled in, causing the water to recede and leaving many streetside "waterfronts" and landlocked "islands."

A former waterfront market is now in the center of town due to some interesting Boston engineering.

This ancient mountain monastery welcomes all manner of faith in an effort to keep Christians in Syria.

A 1,500-year-old ghost settlement is slowly fading away.

Ruins of the Crusaders' headquarters.

A strange aquarium with stuffed fish, and almost no water for them to swim in.

The massive cave church of Cairo's Zabbaleen community is one of the largest Christian churches in the Middle East.

Slum Settlement Filled With Mountains of Garbage.