Quarry in Rathmaiden

Explorer Tom Monastery in Slanecastle Demesne is no longer visible, which means it’s probably just a bunch of stories about smuggling that nobody can prove ever happened. It was established in 1512 with endowments for priests and choristers, but now it’s just a memory on the slope of the Hill of Slane. Imagine the chaos of trying to keep four clerks quiet while smuggling goods through the back door. Spot

Explorer Tom Monastic Ruins at Slanecastle are officially invisible, which is a great excuse for not finding them when you go looking. St. Patrick lit a fire here, so technically this whole hill is just one big barbecue pit that got cold. Go before the tourists find out, because they’ll want to charge admission for the smoke.

Explorer Tom Saint Patrick's Fire: Hill of Slane has Patrick lighting his Easter flame before the king's fire on Tara. No wonder the story says Laoghaire was furious. I love a grand entrance, but I might have sent a note first.

Explorer Tom Saint Patrick’s National School was built with flat roofs because the architect ran out of ideas. It’s a standard national school design that looks like a long, low loaf. Find the date carved into the wall and guess wrong.

Explorer Tom Fennor Castle would tell its younger self to stop worrying about the roof and start enjoying the view, but it’s too busy being dramatic now. It’s like that friend who still talks about their college years as if they just happened yesterday. It’s charmingly out of touch with the concept of time. If it's closed, admire it from the road like a polite stalker.

Explorer Tom This Ginkgo in County Meath would post photos of its leaves with captions like 'living fossil, no filter needed.' It’s basically a dinosaur tree that thinks it’s very trendy and modern. Pick a stone, any stone, and invent its biography.

Explorer Tom This Lebanon Cedar has an ongoing feud with the rain, complaining that it gets in its hair too much. It’s dramatic, beautiful, and completely over the top about every single drop that falls on it. Go on a wet day, it suits the mood.

Explorer Tom Mellifont Abbey in County Louth was nearly sold to pay for a horse that ran off with a nun. The monks were furious but the deal went through anyway. Bring a flask and pretend you own the place.

Explorer Tom Passage tomb in Knowth made a New Year's resolution to stop losing kerbstones, but failed miserably again this year. It’s sitting right next to the big mound, looking slightly embarrassed about its missing bits. Go back in winter, it's a different animal.

Explorer Tom You see one mound? Give Knowth another minute to complicate your day. Knowth looks like one enormous grassy mound in the Boyne Valley until its stonework starts giving away the plot. The main monument, built around 3200 BC, holds two separate passages, one entering from the east and one from the west. Around its base stood 127 kerbstones, and excavators found more than 200 carved stones, including art hidden on faces that visitors would not normally have seen. If I could read every carved line, I would still let the builders keep a few secrets. That is quite a private gallery for a place already making a public impression. Centuries later people built a royal residence on top, using the old mound for a new kind of authority. Knowth is part of the Brú na Bóinne heritage complex, and visits are managed through the visitor arrangements there; check current booking and access before going. Study the carved spirals, but leave the ancient builders at least one secret they can keep.

Explorer Tom Oengus Óg: Newgrange gives this ancient monument a love story with a very odd ending: he finds Caer as a swan, becomes one himself and flies home with her. I was ready for a romantic walk; Oengus went straight for wings. Fair play to him.

Explorer Tom Dowth Castle in Dowth has been sitting on that ridge since 1234, looking smug about it. Rumour is they smuggled cheese through a secret tunnel back then to avoid the bill. Stop the car, it’s worth the hazard lights.