This ancient Greek place of assembly and marketplace is being revealed layer by layer below the modern Athens cityscape.

A 2,000-year-old computer demonstrates remarkable engineering and astronomical precision.

The hallucinogenic center of the ancient world.

A random tree outside a Budapest hotel has become a DIY shrine to the late singer.

Time stands still at this serene burial ground in the center of Budapest.

Late at night, the bust of the "Dracula" actor was snuck onto the facade of this Budapest castle.

Uh, pardon me, ma'am, but I couldn't help noticing that there's a Columbo statue in the middle of Budapest.

The mummified right fist of a 1,000-year-old saint-king sits inside an ornate golden reliquary.

A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.

This Budapest bar allows drinkers to leave their mark on the walls, floor, and even ceiling.

One of the most controversial statues in Romania is an emperor with no clothes.

This memorial to the victims of the Romanian Revolution of 1989 is often compared to a potato on a skewer.

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 solitary monastery may hold the remains of Vlad the Impaler (but probably not).

In the days before house numbers, these colorful signs held clues about various buildings' purposes.

The former home of a mad diplomat is said to still be marked in bloody, arcane scrawls.

Three connected pink triangles memorialize persecuted gays and lesbians throughout history.

This bird-loving brewery is situated in an old municipal bathhouse, nestled beside a 300-year-old windmill.

This unattributed sculpture in Amsterdam is hiding in plain sight.

This city square is home to Amsterdam's oldest church and a statue honoring Dutch sex workers.

Seven mini rowhouses fill the gap between 54 and 70 Westerstraat.

One of the world's first dedicated bank buildings in the world is now the oldest one.