This hulking behemoth is actually five interconnected towers built in the 1960s.

Portugal's National Pantheon has a history of curses, collapses and financial problems.

This charming candle shop has been in business since 1789.

The possible imprisonment of Vlad the Impaler here earned the medieval castle its nickname, "Dracula's Castle."

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

This Transylvanian church has changed its denomination four times.

Nine centuries-old fortresses guard the walls of this medieval Romanian city.

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

A fire once nearly devoured this gorgeous 14th-century Gothic cathedral.

Something's watching you.

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

The skeletal frame of a decommissioned gas-pumping station offers breathtaking views of greater Berlin.

One of the world's heaviest musical instruments towers within a popular urban park.

These former Nazi anti-aircraft towers offer a singular view of the north of Berlin in the summer, and a sanctuary for bats in winter.

The bunker where Hitler took his own life is hidden under this deliberately ordinary parking lot.

A 300-kilogram egg sculpture that embodied a neighborhood revival.

Plaques celebrating Lithuanian writers freckle a wall of this picture-perfect path.

Travelers who fall victim to this mermaid's charms are destined to stay in Užupis forever.

This micro-nation may be some sort of prank, but its constitution sure seems official.

Legend has it that Napoleon Bonaparte fell in love with this Gothic church.

This floating sculpture of ice is a poignant reminder of nature's power.

The design of this beautifully crafted building was inspired by Norwegian glaciers.

This field of half-buried stone crosses was the burial place of a sect of heretical gnostics.

A quirky bookstore hidden beneath a sea of whitewashed Greek villas.