These lush botanical gardens employ the most purrfect pest control force.

Ninety feet off the valley floor is an ancient dwelling put under protection of the U.S. government by Teddy Roosevelt.

This charming colonial alleyway is one of the oldest continuously used residential streets in the U.S.

Instruments, apparatus, and rare books all relating to chemistry and its related sciences.

Yo, Adrian!

A daily replay of the experiment that proved the rotation of the Earth.

The remains of a 37,000-year-old prehistoric society were discovered in this mammoth cave, one of the largest in Asia.

The sounds of the world's largest fully functioning pipe organ dazzle shoppers at a Philadelphia Macy's.

The art museum is decorated with creatively remodeled pre-Nazi swastikas.

This dramatic rail curve was once the target of a failed Nazi attack.

This quiet park's strange sedimentary spires were named after Kodak's color film.

This taxidermic smorgasbord was co-created by an artist poached from the Museum of Natural History.

20,000 pieces in a Frank Gehry-designed building.

No one's quite sure where this quirky university tradition originated.

Giant, friendly pelicans in Central London, the most unlikely of places.

One man's exploration of the human form, including the bizarre and delightful "Man Attacked by Babies."

A 19th-century subterranean reservoir repurposed as a contemporary art cave.

According to legend, this boat-shaped henge is built over the grave of a mythic king.

The old observatory in Copenhagen has a spiral corridor used as a racetrack.

Opulence and fantasy collide in this royal chair which is supposedly made with unicorn horns.

Pre-Nazi swastikas adorn the sculpted pachyderms flanking this brewhouse portal.

Danish tourist destination well known for open stalls where vendors sell marijuana on the street.

Stepping away from the glitz of mobsters and casinos to learn about the other history of Vegas.

The de facto symbol of Copenhagen is this bronze fairytale which cannot seem to keep its head for very long.