It's certainly doable, but it's a pain nonetheless. There must be an easier way. Luckily, using today's technology, there is. To do it the modern way, you would definitely go with concrete.

Yes. Among the Egyptian Pyramids of Giza, the Pyramid of Khufu allows tourists to visit the inside, and the only passageway is from the Grand Gallery to the King's Chamber.

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Yes, and you will find a hand ranking chart on each video poker game as well so that you can keep track of the hierarchy as well as the payout for each hand. Just as in real life, poker hand rankings vary between games, so make sure you know what you are dealing with before you start betting, rather than after.