Ancient serpentine sacrifice holder that has stood the test of time.

No one is sure if the world's fourth-largest diamond had been found in a rubbish heap or was pawned by Napoleon's mom.

Quite possibly the oldest love poem known to humankind.

This column celebrates Rome's victory over the Goths, and may be the oldest Roman monument in Istanbul.

Climb a steep hill in 90 seconds on the second-oldest urban subway in the world.

This remarkably well-preserved Egyptian plinth is pretty well traveled for a giant piece of stone.

A small etching on the white marble parapet was written in runic script by a Viking mercenary.

A meow-velous tribute to a beloved street cat, made famous on the internet.

A marvel of Byzantine engineering under the streets of Istanbul.

This church is named for one of the most dramatic tales in the early Christian church.

This unique building in the main square stands out among the city's typically Baroque architecture.

The floor of this spectacular Baroque sanctuary is covered in memento mori.

Overshadowed by other, more famous Maltese catacombs, this ancient burial chamber has one of the best examples of a ritual agape table.

Burial grounds for more than 1,000 bodies deep under the modern town of Rabat.

This Stone Age solar temple aligns with the sun on each equinox and solstice.

A 16th-century footpath said to be haunted by a young girl that died trapped within its misshapen old house.

This site contains overlapping ancient graveyards that existed about 1,000 years apart.

The Guardian of Tallinn.

Walk along the medieval fortifications that have been protecting Tallinn since the 14th century.

Spend your honeymoon where the Devil had his wedding.

The oldest continuously operating pharmacy in Europe.

On the grounds of the famous Qutab Minar lies another unfinished tower meant to be twice as tall.

The clock tower is a prominent landmark in the bustling commercial hub in the heart of Jodhpur, showcasing intricate architecture and cultural significance.

This cupola was once seen as an architectural disaster.