One of the twin spires of the Basilica del Voto Nacional,
in Quito. You can probably climb up inside it,
but I wouldn't even if I could, since this church sits at one
of the highest spots in the city (which is already
at 9,000 feet); I live at sea level and definitely felt the
effects of the extra altitude when I was there.
[To see more churches from around the world, go here.]