Perched like a magnificent frosted wedding cake atop the lively steps of Montmartre, Sacré-Cœur Basilica (or the Basilica of the Sacred Heart) isn't just a testament to architectural grandeur; it's a divine tip of the hat to Parisian artistry, history, and a bit of good old-fashioned spiritual rivalry. Built from travertine stone, which exudes a constant ethereal glow, this basilica looks like it's perpetually fresh from a heavenly dry-clean. Its construction, commenced in 1875 and concluded in 1914, was a national penance for France's perceived moral decline and military defeat to the Prussians.

The interior is just as jaw-dropping, adorned with one of the world's largest mosaics, which might just trick you into believing you've stepped into a divine comic strip if you squint hard enough. Meanwhile, the panoramic view of Paris from the dome is so breathtakingly beautiful that it's been known to cause spontaneous outbreaks of poetry and, occasionally, a peculiar variety of gentle neck strain from too much awe-inspired gawking.

For those willing to brave the 300 steps to the top (don't worry, there's a "lift" for the faint-hearted), Sacré-Cœur promises an experience that blends spiritual upliftment with a workout more effective than any Parisian gym subscription. It's a must-visit, not just for the devout or the art-obsessed, but for anyone who believes that a bit of cardio can lead to enlightenment—or at least a fantastic view and a well-deserved pastry afterward.