This set of concrete chambers resonates according to different notes of octaves.

An empty relic of the Moscow Olympics crumbles away in Estonia's capital.

"There's nothing there," and other lies the KGB told us.

A secluded art gallery hidden within the cellars beneath Tallinn’s medieval monastery.

Walk along the medieval fortifications that have been protecting Tallinn since the 14th century.

Spend your honeymoon where the Devil had his wedding.

These morbid carvings remind churchgoers of the inevitability of death.

A historic London cemetery now serves as a nature park incorporating gravestones & memorial statues.

This iconic high-rise residential block was one of the last to be built in the Brutalist style.

An easily overlooked stretch of ornate window fronts and gaslight lamps that could be right from the pages of Dickens.

A toy store with a century-long history preserves the craftsmanship of playthings of the past.

Following the trail of an old metro line, this scenic path is haunted by a creepy spriggan statue.

The artist and New York City icon lived, worked and died in this converted carriage house owned by another iconic artist, Andy Warhol.

Colorful murals by Jean Cocteau hide within this peaceful London sanctuary.

A cluttered and astounding collection of antiquities and curiosities.

Elevated freight railway turned wildly successful urban park.

A small marionette collection located within the dark cellars of an 11th-century Austrian castle.

Mozart's skull may be held in this collection, but definitive proof continues to elude scientists.

Ugly 18th-century dwarf statues living in a perfectly landscaped Austrian garden.

Tucked in a nondescript downtown Brooklyn mall is a bar containing a remarkable turn of the century anatomical wax collection last seen in 1920s Berlin.

This beautiful building in the heart of Manhattan's Financial District was empty for decades.

The walls and streets of the ancient city are peppered with penises.

Pompeii's less famous neighbor is still revealing her secrets.

A modern sliver of architecture in Roma.