Mural made of 100,000 pieces of hand blown glass, and one of the largest glass murals in the US.

Plaques on its facade commemorate the Tiber's most destructive deluges.

A detailed pachyderm supports Rome's smallest Egyptian obelisk.

Hundreds of lucky felines haunt the ruins where Caesar was murdered.

A rare example of a medieval house in Rome adorned with a melancholic inscription.

This small church was constructed over the ruins of three temples dating to the Roman Republic.

This small, ancient Roman temple was once a church dedicated to the patron saint of penitents.

This curious, round temple is the oldest still-standing marble building in Rome.

The "Great Sewer" of ancient Rome is one of the oldest sewer systems in the world, and is still in use.

The only remaining arch of the oldest stone bridge in Rome stands in the middle of the Tiber.

This is the oldest Roman-made bridge in the city still existing in its original state.

A square-domed symbol of resilience in the heart of the old Jewish Ghetto.

The art museum is decorated with creatively remodeled pre-Nazi swastikas.

Beneath Denmark's Højbro bridge, a bronze merman and his seven sons forever mourn for the mother and wife who left them for land.

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

Copenhagen's "other" little mermaid marks the historic location of past sea maid sightings.

This bridge's unique architecture honors nautical heritage and encourages self-awareness.

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

This chimerical bridge/tunnel appears to dead end right into the sea.

Swedish skyscraper with a 90° twist.

This pair of gilded girls atop an Art Deco building in Copenhagen were built to function as a weather indicator.

Copenhagen's celebrated theme park and gardens.

Its appearance in "Game of Thrones" may spur on the long-awaited restoration of this medieval shipyard.

The final resting place of the great navigator, or maybe his brother.