The Berachot Site

The first three blessings of this section may be recited only once each day, unless the skies have cleared completely and then the clouds returned. Except as otherwise indicated, the remaining blessings are recited only if thirty days have elapsed since the phenomenon was last seen. If unsure whether to recite one of the blessings in this section on a particular occasion, recite the blessing, but without shem and malchut, the name of Hashem and His kingdom (words 2 - 6).

Upon seeing lightning:

Upon hearing thunder:

Upon seeing a rainbow in the sky:

Upon experiencing an earthquake, or seeing a comet, exceptionally lofty mountains, or exceptionally large rivers (in their natural course):

Upon seeing the ocean (some authorities include the Mediterranean Sea in this category):

Upon seeing exceptionally beautiful people, trees or fields:

Upon seeing exceptionally strange-looking people or animals:

Upon seeing fruit trees in bloom during the spring (this blessing may be recited only once each year):

Upon seeing an outstanding Torah scholar:

Upon seeing an outstanding secular scholar:

Upon seeing a gentile king who rules lawfully, but who cannot be overruled, and who has the power of life and death, the following is recited. Regarding modern-day elected rulers, opinions differ. Most authorities say that the blessing be said without shem and malchut (the name of Hashem and His kingdom):

Upon seeing 600,000 or more Jews together:

Upon one's first meeting with a friend who has recovered from a life-threatening illness:

Upon seeing a destroyed synagogue:

Upon seeing a destroyed synagogue that has been restored to its previous grandeur (many omit the words in parentheses):

Upon seeing a place where one had earlier experienced a miracle that saved him from imminent danger (one who experienced such salvation in more than one place during his lifetime must append a roster of the other places to the end of the blessing):

Upon seeing a place where one's parents, forebears, Torah teacher, or the nation as a whole was miraculously saved from imminent danger:

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