Indents in the pavement are all that remain from a grisly death machine in Paris.

Statue of death tucked in the University of Medicine courtyard.

A tiny Greek Orthodox church from the Ottoman era hides on a busy city street.

View the ancient remains of buildings and the ancient "River of Hades" before hopping on a train.

There are many Byzantine-era churches still standing in Athens, but this is the only one with a 2,500-year-old column rising through its roof.

These caves secretly held national treasures during World War II.

This striking sculpture of Icarus honors Greece's fallen flyers.

This gem is often wrongly overshadowed by the larger, newer Metropolis church in Athens.

The ruined doorway is a portal to the building's turbulent and torturous past.

This small 16th-century church in Athens is almost entirely surrounded by a modern building.

Heralded as the world's first theater, these ruins are often overlooked as they reside in the shadows of the Acropolis.

Legend says this sacred tree was a gift from goddess Athena.

The ruins of an ancient Roman tomb hidden in the basement of a trendy clothing store.

The railway carts travelers to central Athens's highest peak, which offers stunning vistas of the city.

The Cycladic architecture makes this Athens neighborhood feel like an island paradise hidden in the shadow of the Acropolis.

An ancient octagonal weather station named for the eight Greek gods of wind.

A sharp sculpture made of thousands of pieces of jagged glass.

The oldest cemetery of modern-day Athens blends the modern and ancient worlds.

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

This faded sign to nowhere is a beloved icon in New Zealand.

A steampunk airship "floats" above Hamilton Gardens delivering plants and compost.

A New Zealand communications tower stands as the tallest structure in the Southern Hemisphere.

The once and future home of New Zealand's famed Pink and White Terraces.

This sheep farm has been forever transformed since being built for “The Hobbit” film series.