A vast and unlikely aviation museum kept alive for over 50 years due to one man's tenacity.

A former Latvian headquarters of the brutal KGB secret police is now open as a grim reminder of their atrocities.

Flamboyant architecture from the turn of 20th century.

3,000 market stands in five former Zeppelin hangars.

A black cat protests the City Guild in Riga's Old Town.

A former imperial sea-fortress and Soviet prison.

The Guardian of Tallinn.

Disused seaplane hangar gets a second life as the jaw-dropping home of Estonia's museum of maritime history.

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

A forgotten remnant of the Soviet Union, Transnistria is an unrecognized country hidden behind a heavily militarized border between Moldova and Ukraine.

The magic's in the hole!

The deepest lake in the United States, and once the site of epic destruction that lives on in legends.

A chain of 16 wondrous lakes formed as a result of the gradual dissolution of soluble layers of bedrock.

A giant Troll lurks under one of Seattle's oldest bridges.

Try not to get slimed in Tribeca.

Northern Ireland's Brobdingnagian stepping stones.

The first declared National Monument in the United States.

Aqueducts have dramatically changed this old lake, now home to tufa towers and its very own species of tiny brine shrimp.

A walk through the historic city center, under the streets of Seattle.

Dramatic river bend surrounds a natural red-rocked pedestal.

Macabre astrological automaton clock dating to the late 1400s.

A church of bones, decorated with 40,000 human skeletons.

A peculiar mansion built by the troubled heir to the Winchester Rifle Company fortune.