Climb a steep hill in 90 seconds on the second-oldest urban subway in the world.

Legend says if you stick your thumb in the hole and it gets wet, your wish will be granted.

A tiny park in the middle of some big power politics.

Ancient serpentine sacrifice holder that has stood the test of time.

This remarkably well-preserved Egyptian plinth is pretty well traveled for a giant piece of stone.

A marvel of Byzantine engineering under the streets of Istanbul.

A fountain standing as a testament to a doomed alliance.

This crucial gathering spot along the "hippie trail" still displays old notes between traveling beatniks and backpackers.

A giant glider—designed by the father of the Rubik's Cube's designer—now soars within a shopping mall.

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

This sculpture honors the man who was known as the "Righteous Among the Nations."

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

A plaque bearing the names of those who dedicated themselves to protecting Budapest's Jewish population during World War II.

This Budapest bar allows drinkers to leave their mark on the walls, floor, and even ceiling.

A museum in the childhood house of a medical pioneer.

Beautiful antiques and obscure engineering artifacts trace the evolution of phones from rare luxuries to ubiquitous.

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

The true meaning behind this sculpture remains unknown.

A bronze woman in a stylized dress honors a courageous politician.

This easily overlooked memorial immortalizes the scars from the 1956 Hungarian Revolution.

This off-beat, quirky communism-themed bar isn't afraid to poke fun at its history.

This Hungarian castle was built out of cardboard and wood until it proved so popular that it got upgraded to stone.

Late at night, the bust of the "Dracula" actor was snuck onto the facade of this Budapest castle.

Possibly the world's largest hourglass only needs to be reset every New Year's Eve.