|The Colosseum, Rome|
Or the Pont du Gard aqueduct that runs through the south of France.
|Pont du Gard, France|
The arch was also used to celebrate the might of the Romans in distant corners of the empire like Provence, where they built a triumphal arch in the town of Glanum.
|Triumphal Arch of Glanum, Provence|
The triumphal arch was copied centuries later by Napoleon when he built his Arc de Triomphe in Paris to honour those who'd fought for France during the Napoleonic Wars.
|Arc de Triomphe, Paris|
At the base of the monument, the Tomb of the Unknown Soldier honours the fallen soldiers of World War I. The Memorial Flame has never been extinguished since it was first ignited on November 11, 1923.
|Tomb of the Unknown Soldier, Paris|
In the Middle Ages the arch became pointed, which allowed builders to construct soaring Gothic cathedrals like Notre Dame and Sainte-Chapelle.
|Notre Dame Cathedral, Paris|
I love the intricate pattern created by these pointed arches in the fan-vaulted ceiling of a tiny chapel in the Musée Cluny, the Museum of the Middle Ages.
|Chapel Ceiling, Musée Cluny|
But my favourite arches are on a simple rose trellis in the gardens of the Villa Ephrussi de Rothschild, offering perfectly framed views of the cruise ships in Villefranche Harbour.
|Gardens of Villa Ephrussi de Rothschild, Cap Ferrat|
Visit Where's my backpack? for more photos of arches and news on next week's travel theme.