Historic funicular railway, believed to be the shortest railroad in the world.

This iconic L.A. bookshop is housed in an abandoned bank—both symbolic and chic.

Down a cobblestone alleyway is a museum dedicated to Romanticism, with a secret garden.

A horde of stray cats rule in this secluded Parisian cemetery under a bridge.

Claude Monet was baptized in this lavishly ornate Paris church.

The largest mosque in Germany.

Thousands of tourists and residents in Cologne affix "love padlocks" on the Hohenzollernbrücke Bridge to symbolize their affections.

The site of many battles and tragedies, including the 40 maidens who leapt into the sea.

This massive concrete sculpture is said to be the heaviest communist monument on Earth.

Mysterious standing stone formations looks like a petrified forest.

Rebuilt several decades ago, its striking murals prevent it from being reconsecrated as a church.

This massive stone and steel monument remembers a century-old battle that cost thousands of lives and nearly destroyed the city.

Outstanding, eerie frescoes and decorations fill this 19th-century monastery.

This historic black and white monastery is one of Bulgaria's architectural jewels.

UNESCO-protected ancient burial ground.

A mountain pass in Bulgaria's Balkan Mountains was the site of four historic battles.

The remarkably well-preserved final resting place of a powerful ancient Thracian king.

A magnificent, glittering building tucked into a tiny Bulgarian mountain town.

An abandoned saucer-shaped monument in the Bulgarian mountains.

An homage to the medieval rulers of Bulgaria.