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

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.

Only a fragment of this 15th-century Dance of Death survives today.

Estonia's largest creative city is a vibrant bohemian hub located within a former industrial complex.

A trio of giant wooden megaphones turn up nature's volume in this Estonian forest.

This former KGB building is now a museum memorializing the people who suffered during the Soviet regime.

The widest waterfall in Europe is a natural wonder and one of the only places where fish are caught in the air.

Abandoned Soviet base once stocked with short and medium range missiles pointed at western Europe.

This free museum is building a collection of books that are banned, censored or burnt around the world.

The ruins of the first Spanish settlement in Puerto Rico.

This crucial gathering spot along the "hippie trail" still displays old notes between traveling beatniks and backpackers.

This fairy-tale castle would make Dracula (who is said to have been imprisoned there) jealous.

A medieval church built up to defend its village.

Gigantic Romanian salt mines used to heal respiratory conditions.

This 11th-century structure is one of the oldest churches in Romania.

This hauntingly beautiful cemetery outside a medieval citadel is full of winding paths and ivy-covered graves.

The preserved arm of a third-century sorcerer is believed to have the power to lift curses and spells.

Gigantic water vessel, permanently grounded in Southern Albania.

This remote church calls a tiny island its sanctuary.

On a small Puerto Rican island, banks of secret naval bunkers lie abandoned and filled with piles of office equipment.

The ruins of this abandoned fort now stand as a picturesque reminder of America's march West.

An annual two-week festival near the city of Riyadh when Saudis let their hair down.