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

One of the oldest operating hydroelectric power schemes in Australia.

Thousands of slain Soviet soldiers are buried within the shadow of this enormous obelisk.

A little sculpture with a large wardrobe.

Long before ultrasounds and modern testing, medical specimens like these conjoined twins helped physicians learn about congenital anomalies.

The final resting place of the author who gave us the Little Mermaid, the Ugly Duckling, and many more beloved fairy tales.

A novel collection of medical curiosities housed in an 18th-century surgeon training academy.

The gilded, masterful astronomical clock will calculate time, dates, and planetary positions for thousands of years to come.

Climb to the top of its spiral spire for spectacular views of Copenhagen.

Danish tourist destination well known for open stalls where vendors sell marijuana on the street.

Hans Christian Andersen for the postmodern world.

This sublime architectural marvel is a rare example of an expressionist church.

The de facto symbol of Copenhagen is this bronze fairytale which cannot seem to keep its head for very long.

This snug medieval lane is one of the narrowest streets in the world.

Check out engineering marvels of the past at this unintentionally retrofuturist museum.

Romania's triumphal arch looks out over Bucharest.

This communist behemoth is the heaviest building in the world and a legacy of a brutal regime.

The bust of Romania’s most notorious ruler, Vlad Dracula aka "Vlad the Impaler," keeps watch over the ruins of his medieval court.

This once-derelict building is now one of the most beautiful bookstores in the world.

This celebration of Latvia’s freedom and independence avoided demolition over half a century of Soviet occupation.

A small museum contains one of the largest collections of ethnic and traditional headgear in the world.

With over 10,000 lights, this engineering marvel lights up the city after dark.

A cluster of historic bathhouses built on the famed hot springs that gave the Georgian capital its name.

The charmingly disheveled clock tower of Tbilisi's puppet theater.