Even long-distance walkers need a break. Day 36 of one couple's Camino de Santiago was their first 'zero day' — no miles walked, just a slow morning, a late checkout at 10:30 a.m., and enough time to catch the noon Pilgrims' Mass at Santiago de Compostela Cathedral. It turned into the highlight of their entire pilgrimage.

They arrived 75 minutes early to claim front-row seats, a smart move as the cathedral quickly packed to capacity. The gamble paid off: the first two rows had been reserved for a group of American tourists who had paid a €500 donation to make the Botafumeiro fly — the cathedral's famous giant incense burner, normally swung only on special occasions.

The ceremony is pure theatre. Ten priests in traditional velvet robes loaded glowing coals into the censer with a large coal shovel, then added incense over the heat. Each held a 15-foot rope connected to one central line running through a pulley 80 feet up in the vaulted ceiling. As organ music and choir swelled, they pulled in unison and sent the burner soaring — at its highest arc, pouring out thick clouds of incense smoke, it looked set to graze the ceiling. From the third pew, the couple had an unobstructed view.

After Mass, they joined the queue winding around the cathedral to visit the relics of St. James: descending beneath the main altar to see the silver reliquary holding his bones, then climbing the stairs behind the altar to the silver bust, which tradition says pilgrims may kiss (they settled for a touch). From that raised platform, gilded sculpted angels loom directly overhead.

The rest of their zero day was refreshingly ordinary: a Whopper at Burger King — the first in over a decade, but comforting after weeks on the trail — a frantic hunt for last-minute accommodation in the Old City (a lesson in booking ahead at the end of the route), a nap, souvenir shopping, and a quiet evening in a stone-floored apartment with a balcony over an alley. Dinner cost next to nothing: a bottle of oak-aged Reserva wine for around $3, picked up at a local grocery store alongside pre-made salads and fruit.

Why does this matter to travellers? Because a zero day isn't wasted time — it's how you experience the destination you walked hundreds of kilometres to reach. If seeing the Botafumeiro fly is on your list, know that it isn't guaranteed at every Mass: it typically appears on certain feast days and Fridays, or when a group books it with a donation. Arrive well over an hour early, and consider that €500 split among friends is a realistic way to guarantee the spectacle. Also note that Santiago's accommodation fills fast in high season, so secure your bed before you roll into town.

The piece first appeared on The Trek.