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

The ruins of an Estonian prison are drowning in the quarry lake where the convicts were once forced to work.

An entertainment center in a huge transparent tent.

A modern tower, symbolizing the legend of a golden egg on top of the tree of life.

Iconic pyramid from famed British architect Norman Foster designed to represent all of the world's religious faiths.

This sprawling market is a one-stop shop for traditional Kazakh foods, from mare’s milk to sheep’s head.

In Kazakhstan, a colorful cathedral with many lives once survived the most powerful earthquake in the region.

Beatlemania is still going strong... at least in Kazakhstan.

This Soviet-era athletic and recreation facility is the highest ice skating rink in the world.

The lovely lake that was naturally dammed, then naturally destroyed, then unnaturally saved.

Nicknamed Kazakhstan's Grand Canyon, this natural wonder lies east of Almaty near the Chinese border.

Forgotten and then destroyed by fire, this was once one of the largest saltwater swimming pools in the world.

A walk-in working camera obscura produces 360-degree live images of the San Francisco coast.

The seawater playground of gilded-era San Francisco burned to the ground in 1966.

A collection of 20th-century automata, penny arcade games, and musical contraptions.

The highest tides in the world come in and out here twice a day, allowing you to essentially walk along the ocean floor.

A grand New York post office that is home to mailman Santas, scraps of postal history, and a pneumatic mail system.

Visit the monolithic tomb of America's most famous general.

A bit of retro transportation flair preserved in the world's largest department store.

The New York hotel where tragic visionary Nikola Tesla spent his final hours, destitute and alone but for the pigeons.

A crumbling hospital from the 1850s on Roosevelt Island.

Commemorating the spot where the famous scientist fed his pigeons.

The famous facade of Grand Central Terminal hides a regulation tennis court—and it's not the first one.

A very classy 1920s-era bar right in Grand Central Station.