The building's fluid, wavelike walls are a true feat of architectural ingenuity.

Resonant stone, that has been played since prehistoric times.

Home to nearly a third of the world's mud volcanoes, Azerbaijan is home to a messy, bubbling, and sometimes explosive landscape.

A gigantic collection of teeny, tiny books.

This newly renovated Soviet-era outdoor exhibition center is bigger than the principality of Monaco.

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

One of the world's tallest statues is also one of its most hated.

One of the largest collections of socialist realist art shows the surprising depth of the official art of the Soviet Union.

The tallest hotel in Europe.

Moscow's imposing monument to the Space Age.

Former headquarters of the KGB.

A sculpture park of the tossed aside relics of the USSR, from Stalin to a massive Soviet emblem.

The gorgeous entrances into the city's underbelly look more like grand halls than subway stops.

Museum celebrating the achievements of the Soviet space program.

Immortal combat in a Moscow museum.

The bones of two medieval royal lions were discovered at the historic fortress.

This marine reptile was discovered by one of the 19th century's greatest fossil hunters.

The Tudor-style cottage in the middle of the square is not quite what it seems.

These official units of measurement—including chains and perches—lie hidden beneath tourists' feet in a popular London hub.

The rose garden in Regent's Park where Pongo and Perdita met for the first time in Disney's "101 Dalmatians."

Ship-sized kinetic sculptural fantasy.

Bronze sculpture celebrating the relationship between Churchill and Roosevelt.

Charles Babbage's proto-computer, painstakingly brought to life.

The Metropolitan Police refurbished the blue box (perhaps not coincidentally) the same year "Doctor Who" returned to TV screens.