This historic observatory contains the world's oldest refracting lens telescope.

Brisbane's manmade urban beach has enough water to fill five Olympic-sized swimming pools.

The fully functional, submerged Vanuatu Post Office is definitely one of a kind.

The highest tropical mountain range in the world is in Central Peru, home to a vast array of exotic and quirky plants and animals.

Glowing orb in Minsk houses 8,600,000 items.

Rippling sand dunes frozen in the Arizona rock.

The apartment building where JFK's assassin lived after defecting to the Soviet Union.

A striking Soviet memorial commemorates the liberation of Belarus from the Nazis.

A historic scientific breakthrough that crosses nine borders.

Launch site for nuclear war against Western Europe.

An old hill fort covered in over 100,000 crosses is a symbol of Lithuanian nationalism and beliefs.

3,000 market stands in five former Zeppelin hangars.

This geothermal hot spring hides beneath a slowly growing mineral dome.

This abandoned secret city is a crumbling wonderland of Soviet ruins.

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

Flamboyant architecture from the turn of 20th century.

This small Estonian hill is covered in hand-made twig crosses that are said to bring good luck.

A decommissioned submarine base makes a great space for graffiti art.

A subterranean house of worship carved right out of the bedrock.

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

The highest bridge in America was built for an almost unnervingly small amount of money.

The largest source of fossilized insects anywhere.

Once an unstoppable source of gold and silver, this town came to a grinding stop when the groundwater proved deadly.

At the tallest peak in Colorado, an electrifying mix of thin air, lightning, and rivalry.