Underneath downtown Lincoln resides a network of caves that was also the city's first brewery.

This massive railroad spike celebrates the 1939 premiere of the movie “Union Pacific.”

A 98-room castle in the middle of Toronto that bankrupted a 19th century electricity multimillionaire.

A book collector's dream, this Toronto bookstore has the world's first "Biblio-Mat," a random book vending machine.

These experimental weapons brought World War II to Nebraska as well as 26 other U.S. states.

A glass display case holds the document that ended the Second World War—which one person signed on the wrong line.

Once home to over 8,000 exiled Hawaiians suffering from Hansen's Disease.

This mom-and-pop Japanese sweets shop has been serving cloud-light mochi for almost a century.

The only royal palace on U.S. soil has been a territorial capitol, a military headquarters, and a prison for a queen.

This museum of Hawaiian and Polynesian culture is the legacy of the last descendant of the Kamehameha Dynasty.

This industrial area was the dumping ground for massive amounts of trash, some of which washes up as tiny bits of sea glass.

The island of Lanai in Hawai'i is a paradise for cats and cat lovers.

This memorial to a murdered empress took 20 years to design, then spent 30 years hidden away in storage.

A highly-criticized monument in Budapest has become the site of a makeshift Holocaust memorial.

Hungarian Jews were ghettoized during the Second World War, but little remains of the original wall that closed the Jewish people off from the rest of the city.

The holes in this wall provide a glimpse into Jewish life in Budapest, both past and present.

The metal leaves on this tree are engraved with the names of Holocaust victims.

Time stands still at this serene burial ground in the center of Budapest.

A museum dedicated to a secret military hospital hidden beneath a castle in Budapest.

This quaint Hungarian railway system is operated exclusively by children between the ages of 10 and 14.

A Hungarian pharmacy museum with a box full of mummy powder.

Sitting beneath an unremarkable residential building is a museum devoted to classic Pinball.

The romantic garden was the epicenter of the Hungarian art scene in the 1880s.

A Trabant car, a kangaroo statue, and a plethora of plants take over this abandoned-factory-turned-bar.