This palatial botanical garden is home to one of the largest pipe organs ever installed in a private residence, and a piece of Wood's cycad.

The first American department store, and home to the largest operating musical instrument in the world.

This might just be the TARDIS of bookstores.

Eccentric concrete mansion and museum designed and built by hand from the inside out.

Devoted Buddhists can earn enlightenment in the next life by crawling through this symbolic nostril.

This small city where almost everyone lives in the same building can only be reached via North America's longest tunnel.

Largest graveyard in all of Japan surrounds a famous mausoleum.

Museum celebrating the ocean, with the largest wunderkammer dedicated to sea exploration.

This single room has survived the centuries with almost no deterioration.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

Thousands of well-dressed mummies below a monastery.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

A layered tribute to the work of mosaicist Isaiah Zagar.

Historic medieval fortified city in southwest France.

A huge communist-era propaganda monument and mural that offers stunning views of the Mongolian capital.

The world's oldest known salt mine.