A circle made up of 19 boulders has stood in Scotland's Bladnoch Valley for some 4,000 years.

In 1990, this 37-foot red steel bottle sailed from New York to England.

It's believed a castle existed at this site since the 12th century.

Once considered one of the country's finest motte and bailey castles.

The overgrown ruins of this once majestic castle sit forlornly in the Scottish countryside.

Considered "the most original, complete, and unimproved" circles in Aberdeenshire.

This cannonball embedded in the side of an Edinburgh house once served a surprisingly pedestrian purpose.

This remote Scottish island has the only round church in the nation.

Small sculpted heads of prominent phrenologists mark the outside of their former headquarters.

Once the overnight home of Mary Queen of Scots.

The 18th-century inspiration behind Harry Potter's Sorting Hat.

Even though some of the buildings date back to the Victorian era, this research institute is still involved in cutting-edge astronomy research.

A rare example of a Lowland broch.

The ruins of this magnificent Scottish castle blend both Gothic and Renaissance architectural styles.

This impressive Gothic church dates back to 1244 and stands on the site of one of the first churches in Scotland.

These formal gardens were designed to be admired from the vantage point of the castle.

Described by William Wordsworth as a "World of Wonder."

The oldest library in Scotland was built from the remains of a church to hold a churchman's library.

The castle that provided the setting for much of 'Monty Python and the Holy Grail' is now a pilgrimage site for fans.

Some believe that the stone once used to coronate Scottish kings resides inside this bar.

Believed to be the smallest castle in Europe.

This uniquely shaped rock formation is one of Scotland's most iconic mountains and gives spectacular views in all directions.

Bronze plates placed around this Scottish fishing village form a true-scale model of the solar system.

The United Kingdom's smallest working cathedral also serves as a quaint bed and breakfast.