A Jenga-style cylindrical tower of books that appears to go on forever.

Festival of Perpetual Life and Rebirth.

An industrial site turned into Hungary's most cherished natural wonder.

A fake Transylvanian castle houses a cathedral of antlers.

This hidden art nouveau gem was designed by an architect in search of a national style.

An unusual cave filled with rare alien-looking aragonite formations.

This little gem in the Gulf of Riga has a very rich heritage and distinct culture.

The oldest church in the Estonian capital is home to over 100 fantastical cemetery coats-of-arms.

Tombstones buried in overgrown grass mark the deceased occupants of this abandoned graveyard.

A former imperial sea-fortress and Soviet prison.

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

Mysterious craters may have been home to an ancient cult.

This remote sandstone cliff has one of the richest collections of Livonian petroglyph marks.

Latvia's symbolic mountain-shaped national library is home to millions of cultural tomes.

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

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

These crumbling Latvian forts make for some haunting seaside ruins.

Marvel at the excessive luxury of the ousted Ukrainian president's former estate.

This oddly shaped building is a surprising Soviet-era crematorium.

A fortress built to pacify local uprising that had a stint as a Nazi concentration camp before becoming a five-star hotel.

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

This Romanian village may have been drowned, but it is long from forgotten.

No one knows who built this strange cave of worship or exactly why.

A towering spire in the fortress of Kalemegdan honors the victorious armies of Serbia during their struggles against the Ottoman Empire.