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 largest university building in the West is a gothic masterpiece containing dozens of theme rooms based on different countries.

The remains of a community that was forced to move for a dam that never materialized still rot in this Pennsylvania park.

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

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

This might just be the TARDIS of bookstores.

The peaceful space is adorned by paintings by the famed abstract artist Mark Rothko.

This pump on the bad side of Victorian London betrayed a horrifying revelation about the water supply.

A 90-year-old underground water reservoir offers a more industrial kind of tranquility.

Metro station with a claim to rock n' roll fame.

One of downtown Berlin's last reminders of its Communist past.

Cold war icon and onetime "hole" in the iron curtain.

The site of the famous Nazi book burning campaign of 1933 remembers its "Night of Shame".

On the Spree bank, discover one of the last reminders of a symbolic wall that divided, and was torn down by the people.

The most visited, and possibly most controversial, museum in Germany.

Hear the quietest sound from across the dome.

Old Tudor home moved on thick iron rails to a new spot.

At just 25 inches at its narrowest point, it's one of the tightest streets in the world.

The quaint little store that is said to have inspired a famous Dickens novel was only given its name after the book was released.

The perfectly preserved underground rooms where Churchill plotted the war against Germany.

A favorite with sightseers, this Norwegian funicular provides easy access to a stunning view of Bergen and its environs.

Across the Pacific in a raft, a museum dedicated to Thor Heyerdahl's now legendary expedition.

Home to three historic ships from the age of Vikings.

This insurance company building reminds customers that witches, bears, and gnomes are out there, best be insured.