Sloth rehabilitation center in the jungle of Costa Rica.

This Arizona observatory is famous for investigations into Martian life, and as the place humans first spotted Pluto.

This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."

A reproduction of earth's many biomes.

A former plague hospital turned medical museum.

Strange secondhand shop showcasing taxidermy and oddies

Over 120,000 curious objects that have shaped our modern world.

A cabinet of curious mathematical models and old calculators.

A white oak with property rights.

Former utopian colony based on the belief that the universe exists in a hollow sphere.

A tunnel of hardened lava along Maui’s famous Road to Hana.

Welcome to old Florida, where a 1940s mermaid show is still enchanting visitors.

Rippling sand dunes frozen in the Arizona rock.

Abandoned railroad tunnel is home to a colony of three million Mexican free-tail bats.

A museum celebrating the Victorian obsession with hair art.

Bat house that has only ever housed bat for one night; they all flew away and never came back.

Possibly the most beautiful carillon in the world, set atop Iron Mountain in Florida.

Former villa and estate of James Deering developed to preserve native tropical forests.

London's creepiest cemetery was once the site of dueling magicians and mobs of stake-carrying vampire hunters.

A mysterious castle built as a monument to lost love.

Meet manatees face-to-face at this zoo for native species.

What is the Thing?

A somewhat mysterious biomedical museum housed inside a Spanish university.

A haunted hill that supposedly defied gravity.