nyuukanryou ha takai desu.

It is usually read にゅうかんりょう.

• 入館 = entering a building or facility
• 料 = fee, charge

So 入館料 means admission fee or entrance fee.

は marks the topic of the sentence.

So 入館料は高いです is roughly like:

• As for the admission fee, it is high
• or more naturally in English, The admission fee is expensive/high

Also, remember that は is written ha but pronounced wa here.

In Japanese, an い-adjective like 高い can act as the main predicate of the sentence by itself.

So:

• 高い = is high / is expensive

The です at the end does not exactly mean the same thing as English is. It mainly makes the sentence polite.

So:

• 入館料は高い。 = casual
• 入館料は高いです。 = polite

Because 高い is an い-adjective.

With い-adjectives:

• plain form: 高い
• polite form: 高いです

You do not add だ after an い-adjective.

Compare:

• 静かだ / 静かです → 静か is a な-adjective
• 学生だ / 学生です → 学生 is a noun
• 高い / 高いです → 高い is an い-adjective

Both are related meanings of 高い, but in this sentence it means expensive or high-priced.

Because the topic is a fee, English would usually say:

• The admission fee is expensive
• or The admission fee is high

Both are natural translations.

Yes, you could. Both are grammatical, but the nuance is a little different.

• 入館料は高いです
  → As for the admission fee, it is high
  This sounds like you are talking about the admission fee as the topic.

• 入館料が高いです
  → The admission fee is what is high
  This can sound more like you are identifying or emphasizing what is high.

In many everyday situations, both are possible. For beginners, it is enough to know that は marks the topic and が often marks the subject more directly.

Japanese does not have articles like the or a/an.

So 入館料 could mean:

• the admission fee
• an admission fee
• admission fees

The exact meaning depends on context. In this sentence, English usually translates it as the admission fee.

Yes. If you do, the sentence becomes less polite:

• 入館料は高いです。 = polite
• 入館料は高い。 = casual/plain

Both are correct. The version with です is safer in most beginner situations.

You change the い-adjective form:

• 入館料は高くないです。 = The admission fee is not expensive/high.
• 入館料は高くありません。 = a more formal polite negative

Notice that 高い changes to 高くない.

You change 高い like this:

• 入館料は高かったです。 = The admission fee was expensive/high.
• 入館料は高くなかったです。 = The admission fee was not expensive/high.

So the adjective itself changes, not just the ending.

No, not in normal Japanese writing.

Normally it would be written:

入館料は高いです。

Spaces are often added only in textbooks or beginner materials to make the parts easier to see.