Inside the corridors of this flea market, visitors are sure to find some obscure and odd treasures.

A spherical "micro-nation" in the heart of Vienna.

A spectacular Petrine Baroque summer palace commissioned for Catherine I by Peter the Great.

This peculiar border irregularity is the only way to legally enter Russia without a visa.

This behemoth bovine guards an Estonian town and is a memorial to the lost species.

A former waterfront market is now in the center of town due to some interesting Boston engineering.

High winds can make this one scary landing.

New Zealand's only running funicular railway.

Major tourist destination known for its bubbling mud-pools and hot thermal springs.

This electric green sulphur lake in New Zealand looks like a cartoonish radioactive dump site.

Created as a "model concentration camp" to hide Nazi atrocities from the international community, this former camp-ghetto now holds a museum and memorial honoring the lives lost within.

An ornate plague column – built to celebrate life – claimed the lives of numerous artisans during its construction.

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

Macabre astrological automaton clock dating to the late 1400s.

St. Mary's features one of the most spectacularly decorated cathedral interiors in all of Europe.

One of the best-preserved medieval streets in Europe.

These enormous, stern-faced statues greet visitors with lanterns, and sometimes costumes.

This irregularly shaped sea fortress has defended not one but three different sovereign states.

This endearingly discomfited urinating statue commemorates the sneaky pees had by us all.

An alien church provides much needed silence in the midst of a Finland shopping center.

An enormous pair of straw sandals woven in the traditional way—to keep demons at bay.

A shrine contains nearly 200 statues of the Buddhist deity Jizo, dressed in bibs by parents who have lost a child.

A plaque marks the site directly below the mid-air detonation of the atomic bomb over Hiroshima.

Japanese national treasure originally built in 593 CE.