Legions of Roman soldiers bathed in this ancient spa complex under a Budapest transit station.

A marvel of technology a century ago, this disused power station now offers a lovely glimpse into the industrial design of the past.

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.

A 19th century artistocrat's mansion, turned into a library, hidden in a modern library.

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

A series of caves under Castle Hill that once held the prisoner Vlad Tepes, better known as Count Dracula.

Built in 1870 at the bridge that connected Buda and Pest, this spectacular incline railway was almost lost forever during World War II.

Once frequented by heavyweights of the Russian arts scene, this café is stuck in the 1800s.

A Russian museum dedicated to the household staple, the samovar.

One of the last examples of Soviet architectural propaganda has a few technological tricks up its sleeve.

Former estate of Lenin, now home to his death mask.

This frozen-in-time summer home outside Moscow provides a look at Russian life in the 1950s.

The laboratory where the Soviet secret police invented exotic poisons used to kill dissidents in hideous and (mostly) untraceable ways.

Moscow's other, lesser known kremlin is a fairytale-like cultural complex modeled after Old Russia.

An early-20th-century "dacha" village of quaint cottages curiously located in a modern part of Moscow.

Some Moscow residents once claimed the bizarre, contorted mass of metal on top of the building was used to manipulate minds.

It took over half a century but a Russian monument to a famous and tragic space pup finally stands in Moscow.

This small museum is basically a time capsule of daily life in the Soviet Union.

Moscow's most popular cemetery includes the graves of numerous cosmonauts.

Hidden in a metro shop under a shopping mall, this small museum tells the story of one of the world's largest urban transit systems.

Back in the tiny USSR.

This Russian locomotive museum was once devoted just to Lenin's funeral before expanding to encompass Moscow's entire train history.

Dr. Strangelove-esque tours reveal the inside a bunker once reserved for Stalin himself.